We ___have hurried all the way to the airport—the flight was called off because of the foggy weather. 
#87566
A
mustn’t
B
couldn’t
C
needn’t
D
wouldn’t
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Thank you for giving me a hand. I ______ in the experiment without your valuable help. 
#89288
A
have failed
B
will fail
C
would have failed
D
must have failed
If he had worked harder, he _________.
#88201
A
would succeed
B
had succeeded
C
should succeed
D
would have succeeded