AHigh-grade Bwritten paper is Cfrequently Dobtained from cotton rags.

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问题 AHigh-grade Bwritten paper is Cfrequently Dobtained from cotton rags.

选项 A、
B、
C、
D、

答案B

解析 written改为writing。writing paper写字的纸，信纸。

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考博英语

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