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______is estimated that a round-trip to Mars would take more than a year.
A,That       B,what       C,There      D,It

D

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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