—What a pity! Their experiment is a failure.—They ________ better under more favorable conditions.
#86419
A
should have done
B
could have done
C
must have done
D
may have done
推荐题目
It is usually warm in Autumn here. But it _____ be freezing sometimes.
#87981
A
will
B
should
C
may
D
can
Helen couldn’t go to France after all. That’s too bad. I’m sure she would have enjoyed it if _____.
#89357
A
she’s gone
B
she’ll go
C
she’d gone
D
she’d go
— Do you still remember when we went to Nanjing? — I can't remember now but ________sometime last summer?
#89645
A
might it be
B
could it be
C
could it have been
D
should it have been
—The woman biologist stayed in Africa studying wild animals for 13 years before she returned.—Oh, dear! She _______ a lot of difficulties!
#89683
A
may go through
B
might go through
C
ought to have gone through
D
must have gone through
---Mike must have known that.---No, he ________. How _______ he?
#87806
A
mustn’t, must
B
may not, might
C
couldn’t, can
D
needn’t, need