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
You _____ to the meeting tomorrow if you have something important to do.
#75855
A
needn’t to come
B
don’t need come
C
needn’t come
D
don’t need coming
--Whose tennis racket is this, Linda?--Look! Jerry's name is on it! It _________ be his.
#76407
A
may
B
must
C
can't
D
mustn't
–Can you swim? --___________, but my brother Tom can.
#74545
A
Yes, I can.
B
No, I can’t.
C
Yes, I do.
D
No, I don’t.
—What did you say to your sister? I saw her crying in the room.— It _________ my fault. I just said hello to her when I met her, nothing else.
#62216
A
must have been
B
can’t have been
C
oughtn’t to be
D
should have been