---I think Helen is at home.---No, she    be at home, for she phoned me from the airport just five minutes ago.
#63132
A
mustn't
B
needn't
C
can't
D
dared not
推荐题目
--Excuse me,Mr. Li,_________ I close windows? It’s cold now.--Yes,you__________
#76604
A
can; can't
B
can; may
C
may; can’t
D
may; can
Mike ________ his car, for he came to work by bus this morning
#63189
A
can have found
B
could have found
C
can’t have found
D
mustn’t have found