【题目】______ remains doubtful ______ this is an important discovery.
A.That; whetherB.That; thatC.It; whetherD.It; that
在线课程【答案】C
【解析】
考查it用法和主语从句。句意：这是否是重大发现还不确定。分析句子结构可知，第一空应填词是形式主语，只能填it，排除A、B两项；根据doubtful可知，第二空用whether“是否”引导主语从句，排除D项。故选C。
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