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单选题 2级

2010-11-07

Before writing a book, the first thing is considering what to say.

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参考答案

D

答案解析

D
[分析]结构应用
本句考察的是“一致关系”：由before(when，while，if，unless，after等词)引导的分词短语作状语时，这些短语的逻辑主语必须是句子的主语；因此D为答案。

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