【题目】You ________ leave rubbish in a park. （ ）
A. needn't
B. mustn't
C. can't
D. may not
【答案】B
【解析】
句意：你不能在公园扔垃圾。A、不必，B、禁止，C、不能，D、也许不，乱丢垃圾是禁止的，用mustn't，故答案为B。
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