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
It is said that this bridge has ______ for more than three centuries.
A．appeared
B．existed
C．risen
D．born
单项选择题
Electrical ______ made in Japan are very popular with Chinese families.
A．facilities
B．applications
C．instruments
D．appliances
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