______ she couldn't understand was _...

________ she couldn't understand was ________ fewer and fewer students showed interest in her lessons.

A. What ; why B. That ; what

C. What ; because D. Why; that

A 【解析】试题分析：句意：她不能理解的是越来越少的学生为什么对于她的课不感兴趣。第一空是what引导的主语从句，它在从句中作宾语，that不能在主句中作成分，why不能作宾语，故排除BD；第二空是why引导的表语从句，它在从句中作状语，根据句意故选A。考点：考查连词的用法。

考点分析：

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________ she couldn't understand was ___...