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
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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
单项选择题
Living in the desert involves a lot of problems, ______ water shortage is the worst.
A. not to mention
B. of which
C. let alone
D. for what
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