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Theprojectisbasedonanagreement,oneofpurposesistoensurethattheprojectcanbeaccomplishedbeforethedeadline.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?

题目详情
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?
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答案和解析
是whose.如果用which,你认为which和purposes的关系是什么呢?用whose,相当于用了形容词行物主代词,表是“其目的,它的目的”.
比如:This is the room whose windows are broken.