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问题: 为什么不用强调句"it be ……that "

---Did you get home a littlt earlier yesterday ?
---No.It was six o'clock ____we got home.
A.that B.when
为什么选B?

解答:

---Did you get home a littlt earlier yesterday ?
---No.It was six o'clock ____we got home.
A.that B.when

选B。
when引导时间状语从句,it只是代词,指“时间”。

如果想用强调句,应为:
It was at six o'clock that we got home.

因为强调结构it be…that去掉后,句子仍需完整,而题目中缺少了介词at,只有six o’clock是无法充当时间状语的。