C. which
D. where
Before a problem can be solved, it must be obvious ______the problem itself is.
A. what
B. that
C. which
D. why
It is uncertain
side effect the medicine will bring about, although about two thousand patients have taken it.
A. that
B. what
C. how
D. whether
It is none of your business
other people think about you.Believe yourself.
A.how
B.what
C.which
D.when
worries me the way he keeps changing his mind.
A.This
B.That
C.What
D.It
It is pretty well understood _____ controls the flow of carbon dioxide in and out the atmosphere
today. A.that
B. when
C. what
D. how
4、It 作形式主语和it引导强调句的比较
①It 作形式主语代替主语从句,主要是为了平衡句子结构,主语从句的连接词没有变化。
②it引导的强调句则是对句子某一部分进行强调,无论强调的是什么成分,都可用连词that引导,被强调部分指人时也可用who/whom。例如:
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