It was not until 11o"clock yesterday that tom finished all his homework,为啥用that不用when?
问题描述：
It was not until 11o"clock yesterday that tom finished all his homework,为啥用that不用when?
答
it ...that 是强调式.
强调的是时间状语：until 11o"clock yesterday
原句是Tom didn't finished all his homework until 11o"clock yesterday