13.________is known to us all ______ discovered America.( 。
A.It,that whoB.It,whoC.That,who thatD.What,whose who

分析 大家都知道的誰發(fā)現(xiàn)了美洲大陸.

解答 答案:B 句中it是形式主語,真正的主語是后面的主語從句,從句中缺少主語,指代人所以用who.所以本題選擇B.

點評 掌握it的用法,it可以做形式主語,或形式賓語.

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