问题
选择题
About how many elements _____ make up most of the substances we meet in everyday life
A．it is which
B．what it is
C．is it that
D．it is that
答案
答案：C
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About how many elements _____ make up most of the substances we meet in everyday life
A．it is which
B．what it is
C．is it that
D．it is that
答案：C