It is pretty well understood ________ controls the flow of carbon dioxide in and - 高中英语试题 - 超级试练试题库

题目

题型：不详难度：来源：

It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today.

A．that

B．when

C．what

D．how

答案

解析

分析句子结构可知：句子属于形式主语格式；另外主句中缺少主语。双重作用的引导词只能是what。

核心考点

试题【It is pretty well understood ________ controls the flow of carbon dioxide in and】；主要考察你对名词性从句等知识点的理解。[详细]

举一反三

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A．Whoever	B．Whatever
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A．that

B．which

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A．That

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A．When

B．How

C．What

D．That

题型：不详难度：| 查看答案

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