10.About how many elements ____make up most of the substances we meet in everyday life?
问题描述：
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?
答
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 lifeit在主句做的是形式主语,故需以that引导的同位...