---- There is a lot of smoke coming out of the teaching-building there.---- Really? It _____ be a fire, most probably.
#89477
A
can
B
ought to
C
have to
D
must
推荐题目
If they       what I was saying, they'd know what I was talking about
#86853
A
took the trouble to listen to
B
had trouble listening to
C
take the trouble to listen to
D
have trouble listening to
I           sooner but I didn’t know that they were waiting for me.
#87575
A
had come
B
was coming
C
would come
D
would have come
Without your help, I ____the exam last term. 
#89943
A
failed in
B
would have failed
C
wouldn’t pass
D
would fail
This is his only request that the room_______ after being used.
#87382
A
be cleaned
B
would be cleaned
C
is cleaned
D
will be cleaned