people----breathe when they are under water(横线上应填什么)

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people----breathewhentheyareunderwater(横线上应填什么)people----breathewhentheyareunderwater(横线上应填什么)people

people----breathe when they are under water(横线上应填什么)
people----breathe when they are under water(横线上应填什么)

people----breathe when they are under water(横线上应填什么)
A can't
表示不能,能力上的否定.人在水下不能呼吸.

don't

A

can't