单项选择题

Never before in China ______ for the farmers.

A．has so much been done
B．have so much been done
C．has been done so much
D．so much has been done
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单项选择题
He's ______ to know the influence of the phenomenon.
A．perhaps
B．possibly
C．likely
D．certainly
单项选择题
Tom placed too much ______ on sports but not enough on his studies.
A．interest
B．emphasis
C．efforts
D．time
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