题目内容
【题目】-Food safety is very important. -So some rules to stop people from polluting food.
A. must make B. must be made
C. must made D. be made
【答案】B
【解析】
试题分析：句意：-食物安全很重要。-所以必须制定一些制度阻止人们污染食物。本题是一个含有情态动词的被动句；must 必须，be made被制定。所以选B.
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