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