2. 外语
  3. Some people may have been daunted by the task because of the difficulties it brings, but I do not know of______.

Some people may have been daunted by the task because of the difficulties it brings, but I do not know of______.

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问题 Some people may have been daunted by the task because of the difficulties it brings, but I do not know of______.
选项 A、them doing so
B、any having done so
C、their doing like that
D、any doing that way
答案B
解析 用any与not呼应，用完成式表示"至现在还不曾知……"，所以应选any havingdone so，相当于any who have done so。
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