SC比较中的省略问题

CR做的我想吐

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.

• Aeras, therefore concluding that its crust is harboring up to three times as much water than was
• Beras, therefore concluding that the planet's crust harbors up to three times as much water or more as was
• Ceras and have therefore concluded that the planet's crust harbors up to three times as much water as
• Deras and they have concluded, therefore, that its crust harbors up to three times as much water, or more, than
• Eeras and concluded, therefore, that the planet's crust is harboring up to three times more water as was
• 十分疑惑C选项，我认为was不能省略，因为前后时态不同，而且我无法补出省略的部分，希望各位NN帮帮我
• Scientists have found signs that moving water changed the chemical makeup of the surface of Mars in recent eras, therefore concluding that the planet's crust harbors up to three times as much water or more as was（？） previously thought.   
• 不知道省略部分应该是什么
  

S

CR做的我想吐

自己顶！新人求罩！

CR做的我想吐

有没有NN来帮帮我！求助

eziotony1995

CR做的我想吐 发表于 2018-12-6 19:24
有没有NN来帮帮我！求助

这道题我前几天做的时候也觉得很迷，我也觉得was不能省略

CR做的我想吐

eziotony1995 发表于 2018-12-7 17:08
这道题我前几天做的时候也觉得很迷，我也觉得was不能省略

对...但是网上找的解析是说：比较的是主语，因此省略was也没事，我就很迷...