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“which”的用法是which的用法：
1、(用作疑問代詞)哪一個,哪一些
Which is my seat??
哪個座位是我的??
2、(用做關系代詞)那一個,那一些
He also had a gun with which to defend himself.?
他還有一把自衛用的槍。?
3、（用作疑問形容詞)哪一個,哪一些
Which university did you go to, Oxford or Cambridge??
你上過哪所大學?牛津還是劍橋??
4、(用作關系形容詞)這個,這些
The doctor told him to give up smoking, which advice he took.?
醫生叮囑他戒煙,他接受了這一忠告。



擴展資料：
詞義辨析
that和which都可引導定語從句,但以下情況引導定語從句的關系代詞只能用that不能用which。
1、當先行詞是all, everything, nothing, anything, little等不定代詞,或被first, last, only, few, much, some, any, no等詞修飾時,應該用關系代詞that,不用which。
2、當先行詞為形容詞最高級所修飾時,關系代詞用that不用which。
3、當并列的兩個先行詞分別表示人和物時,要用關系代詞that而不用which。
4、在強調句型“It is〔was〕...that〔who〕...”中,只能用that,不能用which。