all living things are made up of cells,______we have learned before.
题目
all living things are made up of cells,______we have learned before.
A.that B.which C.as D.what
为什么用as而不用which
答案
as 和which 作关系代词时都可以代替整个主句,但如果有“正如.一样”,一般用as,如此句“正如我们说学过的那样”,故不用which
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