单项选择题

In order to strengthen his arguments, George ______ respectable social scientists who agree with him.

A. recites
B. confirms
C. quotes
D. convinces
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I walked three kilometers yesterday and am ______ it now; my legs hurt.
A. paying
B. paying for
C. paying back
D. paying off
单项选择题
Agriculture is the country's chief source of wealth, rice ______ by far the biggest cereal crop.
A. is
B. been
C. be
D. being
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