问题
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
B:how; when
C:how; how
D:why; why
正确答案是：
同类题型
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