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
此题考查动词的宾语从句。两个宾语从句中都需要由how 来引导， how在从句中作方式状语，表示“怎么样”。句子中已经有时间和原因状语，所以排除A和D项。