英语：一词之差,意义有别

1. 1)_______is well known to all, the earth is round. 2)_______is well known to all that the earth is round. A.That B.With C.It D.As 解析：句1)是一个定语从句，现行词为the earth is round.中间有逗号隔开。故答案为：D. 句型2) 是一个主语从句，中间没有逗号隔开。故用it作形式主语。答案为：C.

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