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【题目】Polluted air does harm to the living things on the earth. It ______ kill plants as well as even humans.

A.canB.shouldC.mustD.need

【答案】A

【解析】

句意:被污染的空气对地球上的生物有害。它可以杀死植物甚至人类。

考查情态动词。can可能,能够;should应该;must必须;need需要;根据“kill plants”可知是一种能力推测,可推测出此处是“能够”,故选A

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