He________sleep，although he tried to，when he got on such a hunt for an idea until he had caught it.
#62298
A
wouldn’t
B
shouldn’t
C
couldn’t
D
mustn’t
推荐题目
–Someone is knocking at the door. Who ______ it be? --It be Victor. He has gone to London yesterday.
#74530
A
can; mustn’t
B
can ; can’t
C
will; must
D
may; mightn’t
-______ I do the laundry first?-No,you _____. You can do your homework first.
#76288
A
Must;mustn’t
B
Can;mustn’t
C
Must;needn’t
D
May;needn’t
My mother is a great cook and we ________ never get enough of her cookies.
#62281
A
may
B
need
C
should
D
can
—Morn, must I clean my room now?—No, you . You can do it in the afternoon.
#75763
A
mustn't
B
needn't
C
can't
D
don't