【題目】My cousin went abroad at ______ age of eighteen.

A. aB. an

C. theD.不填

【答案】C

【解析】句意：我的表哥在18歲的時候去了國外。at the age of… 在……歲的時候，是一個固定短語，短語中必需用定冠詞the。故選C。

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