Cars play an important role in modern life, but they_______also cause many problems like air pollution．
#89014
A
should
B
can
C
must
D
Will
推荐题目
To qualify yourself for this kind of new job, I recommend that you ________ some online courses.
#86963
A
to take
B
take
C
taking
D
would take
The captain urged that the mission ________ before dark.
#87552
A
must be finished
B
be finished
C
ought to be finished
D
was finished
You must have waited here for a long time ,___________you?
#88229
A
mustn’t
B
didn’t
C
haven’t
D
hadn’t
How ___Mike have refused such a good opportunity to go abroad for further study?
#87462
A
need
B
must
C
can
D
might