— Tom is never late for work. Why is he absent today ?— Something _______ to him. 
#90568
A
must happen
B
should have happened
C
could have happened
D
must have happened
推荐题目
 My demand is that the information referred to in my report _____ to Mr. Brown without delay.
#89509
A
to be e-mailed
B
e-mailed
C
be e-mailed
D
being e-mailed
The workers demanded that their employer_____ their working conditions. 
#86737
A
had improved
B
would improve
C
improve
D
will improve
—I visited China year. —That          interesting.
#87263
A
should have been
B
can be
C
must be
D
must have been