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

試題分析：句意:為了使我們的城市變得更漂亮，不能往河里扔垃圾。由句意可知rubbish 和動(dòng)詞throw 之間是被動(dòng)的關(guān)系，且本句意思是否定的，因此排除A、B兩項(xiàng)。C選項(xiàng)need 是需要；D 選項(xiàng)must 是必須。根據(jù)句意可知選D。
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