◎ 题干

The old lady's hand shook frequently. She explained to her doctor_______this shaking had begun half a
year before, any ____, 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
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◎ 解析
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◎ 知识点
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