Sir,you_____be sitting in this waiting-room.It is for women and children only.(a)A.oughtn’t to B.can’t C.won’t D.don’t为什么不选B?

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Sir,you_____be sitting in this waiting-room.It is for women and children only.(a)
A.oughtn’t to B.can’t C.won’t D.don’t
为什么不选B?

后有be 没有can't be sitting这种说法.表劝诱 用ought to /ought not to等.

选A礼貌