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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单项选择题
Most of the students went to see the film. There are only ______ students studying in the classroom.
A．few
B．a few
C．little
D．a little
单项选择题
This question is so difficult that only ______ students can answer it.
A．a little
B．a few
C．little
D．few
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