题目内容
【题目】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
【答案】B
【解析】
试题分析:往河里扔垃圾这个行为是禁止、不许的,故排除排除A、C。又因为rubbish与throw之间存在被动关系,用被动语态,故选B
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