We      last night, but we went to the party instead.
#87198
A
must have studied
B
might study
C
should have studied
D
would study
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       I’ve been working all day, but I feel as if I _______ nothing.
#88119
A
have been achieved
B
were achieving
C
had achieved
D
am achieving
— No wonder you caught a cold. You _____ out last night without a coat. — I know how silly I was. 
#87891
A
shouldn’t have gone
B
mustn’t have gone
C
couldn’t have gone
D
mightn’t have gone