He is writing ______ on ______ made from ______.

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问题 He is writing ______ on ______ made from ______.

选项 A、a paper, paper, wood
B、paper, a paper, woods
C、papers,a paper, the wood
D、a paper, papers, wood

答案A

解析 paper作为“纸张”讲时为不可数名词,作为“报纸、论文、试卷”讲时为可数名词。本题中第一个paper为可数名词“论文”,第二个paper为不可数名词“纸”,没有复数形式,也不能与冠词连用。
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