It was aout 600 years ago ()the first clock with a face and an hour hand was made.

It was aout 600 years ago ()the first clock with a face and an hour hand was made.

题目
It was aout 600 years ago ()the first clock with a face and an hour hand was made.
答案给的是that 为什么不能用when
或者说什么时候用when 什么时候用that
试从高中语法角度诠释
答案
it is...that 是强调句 强调句的特点是:把it is 和that去掉能还原成一个完整的句子.这个句子把it was 和that去掉可写成:The first clock with a face and an hour hand was made about 6oo years ago.因此这句话是...
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