______ is well known to everyone, I should say, is that a man becomes learned by asking questions.
A.WhoB.ItC.AsD.What
D

試題分析:考查主語從句:這句話有個插入語,去掉插入語后,就會看出,第二個is是謂語,前面的是主語從句,主語從句缺少主語,用what連接主語從句,句意:我要說大家都知道的事情是一個人可以通過提問來學習。選D。
點評:主語從句是在復合句中充當主語的從句,通常放在主句謂語動詞之前或由形式主語it代替,而本身放在句子末尾。解答這類題目,關(guān)鍵在于分析清楚句子結(jié)構(gòu)。通過判斷引導詞在從句中所作的成分及意義,來選擇正確的引導詞。連接主語從句的從屬連詞主要有that, if, whether,和疑問詞(what how where when ...)。that引導表示陳述句的主語從句,if和whether,whether...or not引導表示“是否”,引導一般疑問句。連接代詞主要有who,whom,whose,what,whoever,whomever,whosever,whatever,whichever等。連接代詞一般指疑問,但what, whatever除了指疑問外,也可以指陳述。連接副詞主要有when, where, why, how, whenever, wherever, however等.
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