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【題目】Food safety is important. Rulesto stop people from food pollution.
A.must make
B.must be made
C.can't be made

【答案】B
【解析】句意為:食品安全很重要。必須制定制度來阻止食品污染。因為rule(制度、條例)是動詞make(制定)動作的承受者,所以必須用被動語態(tài)(be+動詞過去分詞)。根據(jù)句意可知為肯定,故選B。

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