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(2014·河南豫北三校联考)________is well known to everyone,I should sa

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(2014·河南豫北三校联考)________is well known to everyone,I should say,is that a man becomes learned by asking questions.
A.Who  B.It
C.As  D.What
D

考查名词性从句。句意为:我应该说,众所周知要长学问,就得多问。句中的I should say是插入语,因此空处应填引导主语从句的连词What。
答案: D