问题
选择题
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
答案
答案：C
考查宾语从句连词。句意：这个老妇人的手颤抖的很频繁，她给她的医生解释这种抖动在半年前是怎样开始的，并且她是怎样因为这个，被迫放弃她的工作的。这样的话，两个空都是怎样，如何，所以是how.