宾语从句的主从句时态可以不一致吗？见OG例句

Jerry_zhou

以下都是OG12中的正确选项，疑惑中，请大侠解惑！谢谢！
1.Although the manager agreed to a more flexible work schedule, he said that it must be posted on the bulletin board so that both management and labor will know what everyone is assigned to do.

2.
A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities are allowed to dump

ba80418

求解释啊！！！！什么叫做“since wer allowed does not appear in any of the options, we can ASSUME that the correct verb tense is are allowed”啊！！！！！这样assume都行？！！