is estimated that a round-trip to Mars would take more than a year. A,That B,what C,There D,It 题目和参考答案——青夏教育精英家教网—

题目内容

______is estimated that a round-trip to Mars would take more than a year.

A,That B,what C,There D,It

【答案】

【解析】

试题分析：通过分析句子结构，可知句子的真正主语是that引导的主语从句，这里需要形式主语，故用it。

考点：it作形式主语

点评：动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用it作形式主语，放到句首。

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