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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