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【题目】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】句意为:食品安全很重要。必须制定制度来阻止食品污染。因为rule(制度、条例)是动词make(制定)动作的承受者,所以必须用被动语态(be+动词过去分词)。根据句意可知为肯定,故选B。

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