情态动词的

情态动词的
.See who’s there!______ I t be Mary?
A.May B.Must C.Can D.Will
2.I’m surprised that he _____ in the exam.
A.should fail B.would have failed C.may have failed D.should have failed
3.She’s already two hours late.What ______ to her?
A.can have happened B.may have happened C.should have happened D.must happen
4.I wonder how he ______ that to the teacher.(95上海)
A.dare to say B.dare saying C.not dare say D.dared say
5._________ be sent to work there?(02,上海)
A.Who do you suggest B.Who do you suggest that should C.Do you suggest who should D.Do you suggest whom should
6.The child ___go home alone at night.
A.wasn’t dare B.dared not C.dared not to D.don’t dare
C,D,A,D,A,B
请讲一下为什么