10.About how many elements ____make up most of the substance

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/18 09:45:32

10.About how many elements ____make up most of the substances we meet in everyday life?
About how many elements ____make up most of the substances we meet in everyday life?
A.it is that
B.it is which
C.is it that
D.is it which
用which,还是用that是怎么看的?
用it is,还是用is it是怎么看的?

我们每天需要的大部分物质大约有多少种元素组成?
主句 About how many elements is it 所以用is it
从句 that make up most of the substances we meet in everyday life
it在主句做的是形式主语,故需以that引导的同位语从句作为实际主语,而不能简单地看作是定语从句

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