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 was at the music hall ______ we met each other for the first time.
A．when
B．where
C．which
D．that
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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