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

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

【答案】A

【解析】句意:青少年在被允許開車前必須年滿18歲。allow動詞,允許;be+動詞的過去分詞,表示被動含義。本句陳述的是事實,所以使用一般現(xiàn)在時態(tài)的被動語態(tài):are/is/am+動詞過去分詞。故選:A。

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