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【题目】–Why ______ we close that chemical factory?

–Because it has caused lots of pollution. We need better environment.

A. must

B. can

C. may

【答案】A

【解析】句意:——我们为什么一定要关闭化工厂?——因为它造成了很多污染。我们需要更好的环境。考查情态动词辨析题。must必须,强调主观意愿;can能,表允许或有能力;may可以,表允许。本句是进行强调,根据句意语境,可知选A。

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