单项选择题

Jack would have been a top student in his school at the time, but he _________hard enough.

A．hadn't worked
B．should work
C．didn't work
D．won't work
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单项选择题
He was shocked to discover that things dragged on well_________ the two weeks he had anticipated.
A．from
B．for
C．away
D．beyond
单项选择题
Due to the great difficulty in business, he decided to_________ the payment of the bills.
A．infer
B．defer
C．confer
D．prefer
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