单项选择题

The house was very quiet, ______ as it was on the side of a mountain.

A. isolated
B. isolating
C. being isolated
D. having been isolated
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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
单项选择题
I walked three kilometers yesterday and am ______ it now; my legs hurt.
A. paying
B. paying for
C. paying back
D. paying off
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