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【题目】Something necessary ___________ to prevent the serious air pollution.

A.must doB.must be doneC.may doD.may be done

【答案】B

【解析】

句意:必须采取必要措施防止严重的空气污染。

A. must do必须做;B. must be done必须被做;C. may do可能做;D. may be done可能被做。主语为Something与动词do之间构成被动,排除AC;再由the serious air pollution可知,是必须被做,故选B

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