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
The light in his office is out. He_________ left for home.
#62358
A
must have
B
must have been
C
should have
D
should have been
Tommy, you____ be hooked on the Internet all day. You may fall behind others in study.
#63526
A
mustn’t
B
shan’t
C
can’t
D
needn’t
Teachers should ___them to continue studying when some students want to give it up.
#75047
A
encourage
B
keep
C
prevent
D
make
—Look! The man at the gate be our headmaster. He stands there every morning.—No, it be him. He is holding a meeting in the office now.
#77353
A
must； can’t
B
must; can
C
can’t; mustn’t
D
can’ t; must
The colour yellow______ the feeling of________．
#77339
A
makes；energy
B
creates；warmth
C
represents；purity
D
creates；harmony