Question

It was about 5 o'clock in the afternoon_they had

It was about 5 o'clock in the afternoon_they had their supper.
A that B what C before D when
正确答案是选D
为什么不选择A呢？

Answer 1

因为后面的句子缺的是时间成分，必须用when修饰。
It was eggs that they had for their supper.他们晚饭吃的鸡蛋。这种情况下缺宾语可以用that.
满意请采纳

Answer 2

如果选A就认为是强调句了，但是依照强调句的判断方法去掉it was和that发现句子结构不完整，所以选c，when作时间状语

Answer 3

D
如果选A的话，about前面要加介词at，者才可以在后面的句子中做时间状语。

Answer 4

It【表时间】 was about 5 o'clock in the afternoon【when】they had their supper

比较：
It was 【at】about 5 o'clock in the afternoon【that】they had their supper.(强调句）

如不明白请追问，要是满意请【采纳】

祝学习进步

Answer 5

when这个地方，引导一个时间状语从句 ，而that只能引导名词性从句。