The project is based on an agreement,one of ________ purposes is to ensure that the project can be accomplished before the deadline.为什么空格答案是whose,而不是which .定语从句介词后面不是只能用whom或which吗?
问题描述：
The project is based on an agreement,one of ________ purposes is to ensure that the project can be accomplished before the deadline.为什么空格答案是whose,而不是which .定语从句介词后面不是只能用whom或which吗?
答