单项选择题

______ took us several hours to clear the snow and open the road to traffic.

A．They
B．All
C．He
D．It
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单项选择题
It is ______ warmer today than yesterday.
A．little
B．a little
C．few
D．a few
单项选择题
We all regard ______ our duty to help those who are too poor to go to school.
A．this
B．it
C．that
D．which
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