-----Who ______ it be that hasn’t handed it in yesterday? ------It _______ be Bob. He handed it in yesterday.
#63423
A
can; mustn’t
B
must; can
C
can; can’t
D
may; mustn’t
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Do you think the plan _________ out as soon as possible?
#63589
A
should carry
B
ought to be carried
C
ought to have carried
D
ought to have been carried
My sister met him at Ningbo Grand Theatre yesterday afternoon, so he         your lecture. 
#63615
A
couldn’t attend
B
mustn’t have attended
C
shouldn’t attend
D
couldn’t have attended