This book teaches us how to analyze is causing the stress in our lift.A. whatB. whenC. why

问题补充：

This book teaches us how to analyze is causing the stress in our lift.

A. what

B. when

C. why

D. How

答案：

(答案→)A. what

B. when

C. why

D. How

解析：句意为：这本书教会了我们去分析在电梯里引起我们压力的因素。

由句意和句型结构可知，此处缺一个连接词和引导词，而what具有此功能，充当宾语从句的连接词和analyze的宾语。

考点:考察what的用法

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