【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(jié)構(gòu)可知，第一空應(yīng)填詞是形式主語，只能填it，排除A、B兩項；根據(jù)doubtful可知，第二空用whether“是否”引導(dǎo)主語從句，排除D項。故選C。

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