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sevengu · 发表于 2011-1-24 20:52:05

A proposal has been made to trim the horns from
rhinoceroses to discourage poachers; the question is
whether tourists will continue to visit game parks and
see rhinoceroses after their horns are trimmed.
(A) whether tourists will continue to visit game
parks and see rhinoceroses after their horns are
(B) whether tourists will continue to visit game
parks to see one once their horns are
(C) whether tourists will continue to visit game
parks to see rhinoceroses once the animals’
horns have been
(D) if tourists will continue to visit game parks and
see rhinoceroses once the animals’ horns are
(E) if tourists will continue to visit game parks to
see one after the animals’ horns have been
oa：c
请问c中为何要用once have been done

orange09 · 发表于 2011-1-24 22:42:29

我觉得这个是虚拟语气~~ once在这里的意思是“一旦” 所以根据其规则需要用现在完成时。。。

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