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Knowing _____, as a matter of fact, one shouldn’t know is a terrible thing.
A.whetherB.thatC.whatD.when
C
考查宾语从句,what为连接词作one shouldn’t know 的宾语,as a matter of fact,为插入语。句意:事实上一个人知道了不该知道的事情是非常可怕的。
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