单选题
Before writing a book, {{U}}the first thing is considering what to say{{/U}}.
A、
you must first ponder what to say and what not to be said carefully.
B、
it's extremely necessary that you know what to say.
C、
the first thing is to consider what to say.
D、
you must first ponder what to say and what not to say.
【正确答案】
D
【答案解析】
[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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