单项选择题

In the north, the price of fresh vegetables ______ seasonally.

A．alters
B．converts
C．fluctuates
D．modifies
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单项选择题
______ I'd like to, I can't come.
A．Much though
B．Though much
C．Much as
D．As much
单项选择题
One reason for the successes of Asian immigrants in the U.S. is that they have taken great ______ to educate their children.
A．pains
B．endeavours
C．efforts
D．attempts
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