问题描述：
14.—— we swim in that river?——No,you .It’s dangerous to swim there.
— we swim in that river?
—No,you .It' s dangerous to swim there.
A.Must; can't B.Can; may not
C.Shall; don't D.May; mustn't
— we swim in that river?
—No,you .It' s dangerous to swim there.
A.Must; can't B.Can; may not
C.Shall; don't D.May; mustn't
问题解答：
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