_____we swim in that river?no,you___.it's dangerous to swim therea.must,can'tb.can,may notc.may,mustn't

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_____we swim in that river?no,you___.it's dangerous to swim there
a.must,can't
b.can,may not
c.may,mustn't

c 选项,我可以.吗,不行这是被禁止的.

是B;;;;

c.may,mustn't....................