问题
选择题
To make our city more beautiful, rubbish _ _ into the river. [ ]
A. needn't be thrown
B. mustn't be thrown
C. can't throw
答案
答案：B
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To make our city more beautiful, rubbish _ _ into the river. [ ]
A. needn't be thrown
B. mustn't be thrown
C. can't throw
答案：B