问题
选择题
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
答案
答案：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.