问题
选择题
Not until____ did Humphrey begin working.
A．did it stop raining
B．had it stopped raining
C．it stopped raining
D．it stops raining
答案
答案：C
题目分析: Not until 结构位于句首时，主句用部分倒装语序，而从句语序不变，仍然是陈述语序，再根据动词did判断用一般过去时，故选C。句意：直到雨停了汉弗莱才开始工作。