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Whale breathe through lungs just as we humans do， so they_______come up for air．（　　）

A．may

B．can

C．might

D．must

【考点】must用法．

【答案】D

【解答】

【点评】

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发布：2024/12/14 20:0:1组卷：92引用：2难度：0.6

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