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 whichC.is it thatD.is it which用which,还是用that是怎

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 whichC.is it thatD.is it which用which,还是用that是怎
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?

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 whichC.is it thatD.is it which用which,还是用that是怎
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

Which 一般前面都会出现逗号隔开
至于 用 is it 是因为 这是一个问句 How **** is it*****？

HOW......部分倒装为IS IT
IT IS THAT强调句

前面是疑问用倒装是is it后面是个定语从句引导主语，若用which不对，因为前面已经解释了他所给的是element

支持一楼的；it is that ;which 应该用在选择句中；

it is that 固定搭配 强调句，强调除动词外的其他句子成分