问题
选择题
220. Mr. Wang was reading ______ on how to learn a foreign language when someone came to see him.
A．paper
B．a piece of paper
C．a paper
D．a sheet of paper
答案
C
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220. Mr. Wang was reading ______ on how to learn a foreign language when someone came to see him.
A．paper
B．a piece of paper
C．a paper
D．a sheet of paper
C