单项选择题

It ________ to see so many children in that mountainous area cannot even afford elementary education.

A. pains her
B. makes her pain
C. is paining
D. is pained
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Internet, a _______ of millions of computers linked worldwide, is the largest system serving email messengers.
A. unity
B. connection
C. network
D. combination
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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