---I feel the house shaking.----So do I .It ___ be sign of an earthquake most probably. Let’s hurry to leave here.
#90314
A
ought to
B
could
C
can
D
might
推荐题目
— 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
It is suggested that a doctor ____immediately.
#86426
A
be sent for
B
send for
C
is sent for
D
should send for