【題目】Teenagers have to be18 years old before they_____to drive a car.

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

【答案】A

【解析】試題分析：句意：青少年在允許開(kāi)車(chē)前不得不達(dá)到十八歲。are allowed被動(dòng)語(yǔ)態(tài)的一般現(xiàn)在時(shí)；C.will be allowed 被動(dòng)語(yǔ)態(tài)的一般將來(lái)時(shí)；D.allow一般現(xiàn)在時(shí)。根據(jù)主語(yǔ)和謂語(yǔ)動(dòng)詞之間的動(dòng)賓關(guān)系，可知用被動(dòng)語(yǔ)態(tài)，結(jié)合句意，可知表示一般情況，故選A。

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