A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities had been allowed to dump into the Great Lakes. (A) reduced the amount of phosphates that municipalities had been allowed to dump (B) reduced the phosphate amount that municipalities had been dumping (C) reduces the phosphate amount municipalities have been allowed to dump (D) reduced the amount of phosphates that municipalities are allowed to dump(D) (E) reduces the amount of phosphates allowed for dumping by municipalities ETS给的解释是: An agreement that occurred in 1972 is correctly described with the past tens verb reduced.Since the dumping continues into the present, the past perfect verb had been allowed should instead be the present are allowed. 来来回回读了好几遍,也没有发现任何指代"present"的词。我觉得还是应该选A,大家说呢? |