A 1972 agreementbetween Canada and the United States reduced the amount of phosphates that municipalitieshad been allowed to dump into the Great Lakes. (A) reduced the amountof phosphates that municipalities had been allowed to dump (B) reduced thephosphate amount that municipalities had been dumping (C) reduces thephosphate amount municipalities have been allowed to dump (D) reduced the amount ofphosphates that municipalities are allowed to dump (E) reduces the amountof phosphates allowed for dumping by municipalities
OG中的解释是Sincethe dumping continued after the date of the agreement, the past perfect verb had been allowed should instead be the present are allowed
题干的意思为什么不是:agreement减少了phosphates的量,(因为在agreement前市民可以把这些物质倒入湖里)
市民可以将物质倒入水里发生在agreement之前,agreement才能起到制约作用吖~
所以是allow 发生在reduce之前,用过去完成时
求轻拍 = =
|