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A proposal has been made to trip 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 and see rhinoceroses once the animals' horns have been 答案是C.可是为什么用 HAVE BEEN??? 只要 ARE TRIMMED 不就够了吗? | 
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发表于 2007-5-6 11:42:00
