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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 so
B.any having done so
C.their doing like that
D.any doing that way

A.
A.them
B.any
C.their
D.any

【参考答案】

B
用any与not呼应,用完成式表示'至现在还不曾知……',所以应选anyhavingdoneso,相当于anywhohavedoneso。
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