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The old lady’s hand shook frequently. She explained to her d

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The old lady’s hand shook frequently. She explained to her doctor ________ this shaking had begun half a year before, 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
C

主要测试宾语从句。有语境可知句子意思:这位老太太的手总是颤抖。她向医生解释了半年前手的晃动是怎样开始的;仅仅因为这一点,她又是如何被迫放弃工作的。解决此题的关键在于分清句子的结构:动词explain后面接了两个宾语从句,原因在于该动词为及物动词,另外再结合从句的结构可知句中只缺少方式状语,故此答案为C.