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767.Some young people these days just _______ go out of their homes to contact the real world.
A.mustn't
B.won't
C.mightn't
D.shouldn't
768.I left my handbag on the train,but luckily someone gave it to a railway official.
How unbelievable to get it back!I mean,someone ______it.
A.will have stolen
B.might have stolen
C.should have stolen
D.must have stolen
