题目内容
13.________is known to us all ______ discovered America.( )A. | It,that who | B. | It,who | C. | That,who that | D. | What,whose who |
分析 大家都知道的谁发现了美洲大陆.
解答 答案:B 句中it是形式主语,真正的主语是后面的主语从句,从句中缺少主语,指代人所以用who.所以本题选择B.
点评 掌握it的用法,it可以做形式主语,或形式宾语.

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