-Who’s that girl swimming in the pool? Is it Lucy?-It        be Lucy. She is sleeping in her bedroom now.
#74922
A
may
B
can’t
C
must
D
should
推荐题目
My sister met him at the street yesterday afternoon, so he __________ your lecture.
#63077
A
shouldn’t have attended
B
couldn’t have attended
C
mustn’t have attended
D
needn’t have attended
—Must I finish the book today?—Yes, you ________, but you ________ finish it now. Have a rest.
#75918
A
do; don’t have to
B
do; mustn’t
C
must; don’t have to
D
must; mustn’t
There’s still an hour left, you _____ go in a hurry. 
#74519
A
must
B
needn’t
C
can
D
mustn’t