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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单项选择题
The thieves ________ the possibility of the alarm system sounding.
A．overtook
B．overcame
C．overlooked
D．overworked
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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