Scientists have found signs that moving water changed the chemical makeup of the surface of Mars in recent eras, therefore concluding that its crust is harboring up to three times as much water than was previously thought.
(A) eras, therefore concluding that its crust is harboring up to three times as much water than was
(B) eras, therefore concluding that the planet's crust harbors up to three times as much water or more as was
(C) eras and have therefore concluded that the planet's crust harbors up to three times as much wateras
(D) eras and they have concluded, therefore, that its crust harbors up to three times as much water, or more, than
(E) eras and concluded, therefore, that the planet's crust is harboring up to three times more water as was
正确选项是c
求教NN们，我怎能看怎么都觉得c的最后少了一个像e选项最后的那个was，as...as...结构中这两个as都是什么词性啊？是不是c选项红色as后的那半句话涉及省略了啊？
求解，谢谢！！！
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发表于 2011-9-18 20:39:08
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