问题 选择题

To do some voluntary work for the 2nd Youth Olympic Games is ______ excellent chance for us to serve our hometown—Nanjing.

A.a

B.an

C.the

D.不填

答案

B

表示事物类别在名词前加不定冠词,excellent第一个音是元音,在前加an,故本题选B。

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