I __ he had finished his homework at this time

问题描述:

I __ he had finished his homework at this time
A.think B.thought
这里为什么不用think呢?

I __ he had finished his homework at this time
选B
因为从句部分原本的时态是一般过去时,因为有时间状语【at this time】
因为现在用的是过去完成时,所以只可能是主句时态是一般过去时,导致从句时态往前推了一格