选择：

题目

选择：
翻译：
Not until he finished his homework () him to watch TVin the evening.
A his mother allowed
B his mother had aoolwed
C did his mother allow
D had his mother allowed
为什么选它?

答案

选C
Not until打头的句子要用倒装所以A,B排除.had done是过去完成时,也就是说在过去的某个时间已经完成的动作,allow的动作发生在finish之后,因此不用had done 所以选C