问题
选择题
_____ I cannot understand is _____ she wants to resign her present job.
A．What; why
B．Which; how
C．That; why
D．What; which
答案
答案：A
考查名词性从句的连接词。此处what是主语从句的连接词，其在句中作understand的宾语；第二空why在表语从句中作原因状语。句意：我所不能理解的是她为什么辞去了他目前的工作。