[求助]855 SC New Problems

newbee

Sec 13-14
14.Researchers have questioned the use of costly and experimental diagnostic tests to identify food allergies, such as milk, that supposedly disrupt normal behavior.
(A) to identify food allergies, such as
(B) to identify food allergies, like
(C) to identify food allergies, such as to
(D) for identifying food allergies, like that of
(E) for identifying food allergies, such as for
答案是C。是不是选项C 同时省略了 “identify” and “allergy”?

Sec 14-19
19.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
(E) reduces the amount of phosphates allowed for dumping by municipalities
答案是A。
请问，如果是当时市政当局允许把Phosphates倾倒进五大湖，但是1972年的agreement（不是禁止倾倒的协议，而只是限制倾倒的协议）只是减少了amount，而不是禁止了dump，那么allow的时态应该是什么样的呢？

newbee

感谢两位的解答。
不过尽量尊重原文是比较好的方法。