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大家作一语法题

Although it is conceivable that certain electronic devices implanted in the brain may someday correct blindness caused by nerve damage, there is now no clear evidence * of their ability to do it*
A\
B\ of their doing so
C\ that they can do so
D\ that they may one day be able to do so
E\ to do so
----------------
try to find the best answer, although it maybe easy to you.
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Robert之家-----我的家园

不不不!they=devices 。
Robert之家-----我的家园

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C的主语应该是they,充当evidence 的同位语从句,对否?

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答案:C。E的错误在于:DO的执行者似乎是evidence。
Robert之家-----我的家园

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