【題目】Teenagers have to be 18 years old before they ________ to drive a car.

A. are allowed B. allowed C. will be allowed D. allow

【答案】A

【解析】句意:-在青少年們被允許開車之前他們必須到18歲。are allowed被允許,一般現(xiàn)在時的被動語態(tài);allowed過去式;will be allowed一般將來時的被動語態(tài);allow動詞原形。根據(jù)句意可知,they代指teenagers,與動詞allow構(gòu)成被動關(guān)系,應使用被動語態(tài),before引導的時間狀語從句中用一般現(xiàn)在時態(tài),故選A。

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