It was early in the morning

It was early in the morning____the train accident took place.A since B when C where D that

热心网友

D that （这是个强调句）强调句型的结构：It is / was + 被强调部分 + that / who + 原句其余部分强调句中，被强调部分通常是原句中的主语、宾语、表语、时间状语或地点状语。被强调部分指人时，其引导词用that或who，其他情况通常用that（间或用which）。将原句还原为正常结构的句子：The train accident took place early in the morning.

热心网友

这句不是强调句，应是WHEN

热心网友

that , it was ...that , 强调句。强调时间状语was early in the morning。

热心网友

D that 强调句.

热心网友

B. when