【題目】Teenagers______to smoke in public.

A. allowB. don’t allowC. aren’t allowedD. allowed

【答案】C

【解析】

句意：青少年不允許在公共場所吸煙。A為動詞原形；B為主動語態(tài)；C為被動語態(tài)；D為一般過去時，主動語態(tài)。Teenagers與“allow”之間是被動關(guān)系，所以使用被動語態(tài)。allow sb. to do sth. 變成被動語態(tài)后為：sb. + be allowed to do sth. 故選C。

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