单项选择题

His health ______, my uncle had to leave the air force in 1948.

A．failed
B．was failed
C．fairing
D．had failed
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单项选择题
Had it not been for his help, I ______ the task within such a short time.
A．can't complete
B．couldn't complete
C．wouldn't complete
D．couldn't have completed
单项选择题
Hearing the news, the boy burst into ______ .
A．laugh
B．laughing
C．laughter
D．laughable
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