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【题目】We ________ throw rubbish into the river. The fish will die if the river is polluted.

A.couldn’tB.mustn’tC.may notD.wouldn’t

【答案】B

【解析】

句意:我们坚决不能把垃圾扔到河里。如果河水被污染鱼就会死。

考查情态动词。couldn’t不能;mustn’t 绝对不能;may not也许不能;wouldn’t不会。把垃圾倒是河里造成河水污染是坚决不能做的事,禁止做的事,故选B

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