Air cannot ______,but it is all around us.A、is seenB、seeC、be seenC情态动词cannot

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问题 Air cannot ______,but it is all around us.

选项 A、is seen
B、see
C、be seen

答案 C

解析情态动词cannot后应跟动词原形，根据意义应用被动语态。

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