单项选择题

The desegregation was achieved through a number of struggles, ______ have 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
He appreciated ______ the chance to deliver his thesis in the annual symposium on Comparative Literature.
A. having given
B. to have been given
C. to have given
D. having been given
单项选择题
I have the honor of introducing to you Mr. Alan, who will ______ you on his recent tour abroad.
A. address
B. speak
C. talk
D. converse
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