自2010年至今的四级考试中， 共出现过 次
自2010年至今的六级考试中， 共出现过 次
DET （指初次提及或非特指的人或物）一（个） You use a or an when you are referring to someone or something for the first time or when people may not know which particular person or thing you are talking about.
A waiter entered with a tray...
He started eating an apple...
DET （一类人或事物中非特指的）任何一（个） You use a or an when you are referring to any person or thing of a particular type and do not want to be specific.
...expensive make-up that we saw being advertised by a beautiful model...
I suggest you leave it to an expert...
DET （用于前加形容词或后加修饰语的不可数名词之前）一（种） You use a or an in front of an uncount noun when that noun follows an adjective, or when the noun is followed by words that describe it more fully.
There was a terrible sadness in her eyes...
He did have a real knowledge of the country...
DET （用于物质名词前）一（类），一（种） You use a or an in front of a mass noun when you want to refer to a single type or make of something.
Bollinger 'RD' is a rare, highly prized wine.
DET （用于表示数量的词组中）许多/少许/一点 You use a in quantifiers such as a lot ,a little, and a bit.
I spend a lot on expensive jewelry and clothing...
I've come looking for a bit of advice.
DET （一类人或事物中典型的）一（个） You use a or an to refer to someone or something as a typical member of a group, class, or type.
Some parents believe a boy must learn to stand up and fight like a man.
...the operation a patient has had.
DET （用于日子、月份或节日的名称之前以表示特例）一个 You use a or an in front of the names of days, months, or festivals when you are referring to one particular instance of that day, month, or festival.
The interview took place on a Friday afternoon...
It was a Christmas when shoppers passed by expensive silks in favor of more practical gifts.
DET （从事某一职业的）一（位），一（名） You use a or an when you are saying what someone is or what job they have.
I explained that I was an artist...
He was now a teacher and a respectable member of the community.
DET （用于不为说话人所知的首次提到的人名前）某一（个） You use a or an in front of the names of people as a way of indicating that you do not know them or anything about them and you are saying their name for the first time.
The full address on a stick-on label was that of a Mrs P. R. Slater of Peterborough...
不干胶标签上的完整地址写的是彼得伯勒的一位P. R. 斯莱特太太。
A Dr Matthew Owens was reported missing while on an expedition to north-eastern Turkey.
DET （用于人名前，表示与该人有相同特性或品质）类似…的一个（或一位） You use a or an in front of the names of people when you want to refer to someone else who has the same qualities or character as the person named.
When I listen to her play I can hear a new Nigel Kennedy.
DET （用于姓氏前，表示某人属于某姓氏家族）一位姓…的人 You use a or an in front of a surname when you want to refer to someone who belongs to the family with that surname.
As far as I can recall, Patti was a Smith.
DET （用于艺术家名字前）一幅…的画，一件…的雕塑作品 You use a or an in front of the names of artists to refer to one individual painting or sculpture created by them.
Most people have very little difficulty in seeing why a Van Gogh is a work of genius.
DET （代替数字one使用，尤用于hundred，hour和metre等表示度量的单词之前以及half, quarter和third等分数之前） You use a or an instead of the number 'one', especially with words of measurement such as 'hundred', 'hour', and 'metre', and with fractions such as 'half', 'quarter', and 'third'.
...more than a thousand acres of land.
...a quarter of an hour...
DET （用于表示比率的短语中）每一 You use a or an in expressions such as eight hours a day to express a rate or ratio.
Prices start at £13.95 a metre for printed cotton...
The helicopter can zip along at about 150 kilometres an hour.