◎ 题干
The old lady's hand shook frequently. She explained to her doctor ______this shaking had began half a year before, and ______, only because of this, she had to give up her job.

A. when; how      
B. how; when      
C. how; how      
D. why; why
◎ 答案
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◎ 解析
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◎ 知识点
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