题目内容
To make our city more beautiful, rubbish ______ into the river.
A.needn't be thrown B.mustn't be thrown
C.can't throw D.mustn’t throw
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题目内容
To make our city more beautiful, rubbish ______ into the river.
A.needn't be thrown B.mustn't be thrown
C.can't throw D.mustn’t throw