【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(kāi)車(chē)之前他們必須到18歲。are allowed被允許,一般現(xiàn)在時(shí)的被動(dòng)語(yǔ)態(tài);allowed過(guò)去式;will be allowed一般將來(lái)時(shí)的被動(dòng)語(yǔ)態(tài);allow動(dòng)詞原形。根據(jù)句意可知,they代指teenagers,與動(dòng)詞allow構(gòu)成被動(dòng)關(guān)系,應(yīng)使用被動(dòng)語(yǔ)態(tài),before引導(dǎo)的時(shí)間狀語(yǔ)從句中用一般現(xiàn)在時(shí)態(tài),故選A。

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