He ________ the window of our classroom yesterday because he didn’t come to school．
#88280
A
mustn’t have broken
B
mightn’t have broken
C
shouldn’t have broken
D
couldn’t have broken
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Mary is ill today. If she _____, she ____ here at school
#86351
A
were not ill；would be
B
had been ill；wouldn't have been
C
were ill；should have been
D
hadn't been ill；could be
—This wall of air is an effective answer to the problem and it ____ work. —But it is a question to put such a wall of air around the statue.
#89204
A
may
B
must
C
should
D
could
Sorry，I am too busy now.If I ________ time，I would certainly go for an outing with you.(2012·湖南)
#86551
A
have had
B
had had
C
have
D
had
—Shall I help clean the kitchen, Mum?—Thank you.But you ________ it because I can do it myself.
#86356
A
mustn't have done
B
wouldn't have done
C
mightn't have done
D
haven't got to do