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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

試題分析：通過(guò)分析句子結(jié)構(gòu)，可知句子的真正主語(yǔ)是that引導(dǎo)的主語(yǔ)從句，這里需要形式主語(yǔ)，故用it。
點(diǎn)評(píng)：動(dòng)詞不定式，動(dòng)名詞或主語(yǔ)從句作主語(yǔ)時(shí)，通常把它們放在謂語(yǔ)動(dòng)詞前，而用it作形式主語(yǔ)，放到句首。
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