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Food safety is important. Rules _____ to stop people from food pollution.
A．must makeB．must be made
C．can makeD．can be made
B

試題分析：句意：食品安全是重要的。制度必須制定來阻止人們污染食品。前句說道食品安全重要，因此必須制定制度，排除C和D；rules做主語應用被動語態(tài)，故選B。
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