26、_____ I left school he had taught our class for two years.

问题描述:

26、_____ I left school he had taught our class for two years.
A Whenever B The moment C By the time D Since
这里的C和D应该怎样选择..有点压力...

应该选C.
By the time 直到我们离开学校(在此之前)
Since 我们离开学校后直到现在(在此之后)
根据意思,他教了我们2年,那只能是之前.