Some people may have been daunted by the task because of the difficulties it bri

游客2025-03-20 9

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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Hetriedtorelaxbecauseheknewhewoulduseupmyoxygensooner______.A、them