I was caught in a traffic jam for over an hour, otherwise I ________ you waiting for such a long time.
#86683
A
will not keep
B
have not kept
C
had not kept
D
would not have kept
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______ he was at home, I would have phoned him then.
#86596
A
Had I known
B
I had known
C
Would I know
D
I would know
The boy         the first prize, but he was so careless as to make a foolish mistake.
#87720
A
must have gained
B
need have gained
C
could have gained
D
shall have gained
— Catherine, I have cleaned the room for you. — Thanks. You ______ it. I could manage it myself. 
#90498
A
needn’t do
B
needn’t have done
C
mustn’t do
D
shouldn’t have done