220. Mr. Wang was reading on how to learn a foreign language when someone came to see him

发布时间：2020-08-16 07:02:28


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

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A. paper
B. a piece of paper
C. a paper
D. a sheet of paper
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