This is Mr John for ___ son I bought a book yesterday.答案为whose 为什么应填此答案难道不是 关系词前有介词，关系词只能是which和whom

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• This is Mr John for ___ son I bought a book yesterday.答案为whose 为什么应填此答案难道不是 关系词前有介词，关系词只能是which和whom
• 1.This is Mr.li for ____ son I bought a book yesterdayThis is Mr.li for ____ I bought a book yesterday.分别是 whose 和 whom 为什么?2.He lives in the room ____ window faces to the north.He lives in the room,the window _____ faces to the north.分别是 whose 和 of which 为什么?这2句的分析及句子成分
• he often ( )to turn off the lights so his father is very angry with himi'm ( )a long vacation this summer