Some people may have been daunted by the task because of the difficulties it brings,but I do not know of ________.A.them doing soB.any having done soC.their doing like thatD.any doing that way为什么?为什么不是选C?

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Some people may have been daunted by the task because of the difficulties it brings,but I do not know of ________.A.them doing soB.any having done soC.their doing like thatD.any doing that way为什么?为什么不是选C?
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Some people may have been daunted by the task because of the difficulties it brings,but I do not know of ________.A.them doing soB.any having done soC.their doing like thatD.any doing that way为什么?为什么不是选C?
Some people may have been daunted by the task because of the difficulties it brings,but I do not know of ________.
A.them doing so
B.any having done so
C.their doing like that
D.any doing that way
为什么?为什么不是选C?

Some people may have been daunted by the task because of the difficulties it brings,but I do not know of ________.A.them doing soB.any having done soC.their doing like thatD.any doing that way为什么?为什么不是选C?
their doing 指“他们做的……事”,为名词词性,结合句子来说明显不通,而A中them指代the difficulties it brings,doing SO指做这个任务,刚刚好.

据我知道的,of后多接宾格,their是形容词性物主代词,不能跟在of后。希望对你有用。