问题
选择题
Food safety is important. Rules ______ to stop people from food pollution. [ ]
A. must make
B. must be made
C. can't make
D. can't be made
答案
答案：B
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Food safety is important. Rules ______ to stop people from food pollution. [ ]
A. must make
B. must be made
C. can't make
D. can't be made
答案：B