单项选择题

In my country, the ________ are all distributed free.

A．letters box
B．letters boxes
C．letter's box
D．letter boxes
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单项选择题
The desegregation was achieved through a number of struggles, ________ been mentioned in previous chapters.
A．a few of which
B．a few of them
C．a few of those
D．a few of that
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