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I had thought that he knew everything about the plan,but___t

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I had thought that he knew everything about the plan,but___turned out,he didn't know anything
about it.
A.it
B.what
C.as it
D.as
答案:A.it
因为这是几个并列句在一起,标志是:and、so、but、yet、or.这里是but连接的并列句,表示转折.必须用it做句子的主语.
明白了吗?
再问: zhengjie shi c