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
767.答案是B;考查情态动词的用法，won't不愿意，具有主观性。
768.答案是B;must have done一定做过某事，表示对过去事情的肯定推测；should have done本来应该做某事，而实际没做；might have stolen过去可能做过，语气比较婉转或不肯定。
