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To make our city more beautiful ,rubbish ______ into the river.
A.must throwB.can’t throwC.needn’t be thrownD.mustn’t be thrown
D

试题分析:句意:为了使我们的城市变得更漂亮,不能往河里扔垃圾。由句意可知rubbish 和动词throw 之间是被动的关系,且本句意思是否定的,因此排除A、B两项。C选项need 是需要;D 选项must 是必须。根据句意可知选D。
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