—I called you at 9 last night,but no one answered.—Sorry,I ________ sleeping.I went to bed very early. 
#62284
A
need have been
B
would have been
C
must have been
D
should have been
推荐题目
 You __________be tired—you’ve only been working for an hour.
#62234
A
must not
B
won’t
C
can’t    
D
may not
His failure suggested that he   the teacher’s suggestions.
#62975
A
can’t have followed
B
needn’t follow
C
mustn’t have followed
D
shouldn’t follow