A 1972 agreement between Canada and the United states reduced the amount of phosphates that municipalities are allowed to dump into the Great Lakes. 这个是正确的句子。请问为什么这里要用 are allowed啊??? 看过OG解释后狂郁闷!!OG说是因为 “签订协议后,倾倒仍然在继续 ,如果写这个句子的时候协议还有效就用are allowed;如果写这个句子的时候协议无效了就用were allowed。” 为什么啊?? 困惑?!求教大家! 谢谢!!
A 1972 agreement between Canada and the United states reduced the amount of phosphates that municipalities are allowed to dump into the Great Lakes. 这个是正确的句子。请问为什么这里要用 are allowed啊??? 看过OG解释后狂郁闷!!OG说是因为 “签订协议后,倾倒仍然在继续 ,如果写这个句子的时候协议还有效就用are allowed;如果写这个句子的时候协议无效了就用were allowed。” 为什么啊?? 困惑?!求教大家! 谢谢!!