If human beings had been a bit less greedy and cruel, more birds and animals _______dying out.
#89245
A
ought to avoid
B
could have been avoided
C
should have avoided
D
might have avoided
推荐题目
---The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job? ---____ my students have a try?
#87077
A
May
B
Must
C
Will
D
Shall
The chemistry teacher demanded that the laboratory report _________ immediately after the experiment was done.
#87383
A
to be written
B
would be written
C
be written
D
must be written
They didn’t attend the discussion, although they _________.
#87947
A
should
B
would have to
C
should have to
D
should have
— The woman biologist stayed in Africa studying wild animals for 13 years before she returned. — Oh, dear ! She ______ a lot of difficulties !
#90563
A
may go through
B
might go through
C
ought to have gone through
D
must have gone through