【題目】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:必須采取必要措施防止嚴重的空氣污染。

A. must do必須做;B. must be done必須被做;C. may do可能做;D. may be done可能被做。主語為Something與動詞do之間構(gòu)成被動,排除A、C;再由the serious air pollution可知,是必須被做,故選B

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