【題目】______ remains doubtful ______ this is an important discovery.

A.That; whetherB.That; thatC.It; whetherD.It; that

【答案】C

【解析】

考查it用法和主語從句。句意:這是否是重大發(fā)現(xiàn)還不確定。分析句子結構可知,第一空應填詞是形式主語,只能填it,排除AB兩項;根據(jù)doubtful可知,第二空用whether“是否”引導主語從句,排除D項。故選C。

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