单项选择题

She had to be very ______ to feed such a large family, especially when her husband was out of work.

A．economic
B．economical
C．careful
D．efficient
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单项选择题
It was reported that the project ______ by the end of this month.
A．will be completed
B．will have been completed
C．would have completed
D．would have been completed
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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