—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
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--Mike’s bike didn’t work yesterday, so he didn’t go there with his deskmate. --He _________ mine. I wasn’t using it then.
#88006
A
need have used
B
must have used
C
could have used
D
can have used
That day they ________ there on foot, but they took a taxi. The place was only 50 meters away from the railway station.
#88127
A
must have gone
B
shouldn’t have gone
C
could have gone
D
couldn’t have gone
---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