It was not until dark( )he found that he worked out the last result of the experiment.

问题描述:

It was not until dark( )he found that he worked out the last result of the experiment.
A.what B .that C.when D.before
求这种类型的三种句式结果并解释.(until when什么的)
3Q~

C.when .
直到天黑他才得到实验的最后结果.