题目

_______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 答案：D 解析：　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。

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