不明白了，

来源：百度知道 编辑：UC知道 时间：2024/05/03 20:55:53
The old lady's hand shook frequently .She explained to her doctor___this shaking had begun half a year, and____,only because of this, she had been forced to give up her job.

A :when how B: how when C: how how D: why why

答案是C 不明白，没翻译通顺！

给医生解释1：颤抖是怎么开始的。2；她是怎么因为颤抖而丢掉工作的

两个都需要表"方式"
有准确时间half a year自然WHEN就不行了;
如果老太太自己知道原因就不用医生来告诉她了,WHY也不对;
所以选C