【題目】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:我們堅決不能把垃圾扔到河里。如果河水被污染魚就會死。

考查情態(tài)動詞。couldn’t不能;mustn’t 絕對不能;may not也許不能;wouldn’t不會。把垃圾倒是河里造成河水污染是堅決不能做的事,禁止做的事,故選B。

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