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～
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～
答
C. when
答
C
答
C.when .
直到天黑他才得到实验的最后结果.