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【题目】We need clean air and water. So we__________ protect the environmen.

A.mustB.canC.may

【答案】A

【解析】

句意:我们需要干净的空气和水。所以我们必须保护环境。

考查情态动词。must必须、一定;can能、能够;may可以。根据We need clean air and water. 我们需要干净的空气和水,可知我们必须要保护好环境才能有干净的水和空气,所以填must,故答案选A

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