【題目】Some rules _________ to stop people from polluting the environment.

A.must make B.must be made C.must made D.be made

【答案】B

【解析】rules和make之間是被動關系，由此排除A和C；分析語境可知此處指的是“一些條例必須制定來防止人們污染環(huán)境”，“必須……”用must，不可省略。

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