【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】

試題句意：青少年被允許開車前，他們必須滿18歲。主語they是動詞allow的承受者，應(yīng)用被動語態(tài)；對一般常規(guī)情況的陳述，應(yīng)用一般現(xiàn)在時。因此句子為一般現(xiàn)在時態(tài)的被動語態(tài)，故答案選A。

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