---where is the comic book?---i brought it to you -----you were in the reading room yesterday.when if because before 选哪个?

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---whereisthecomicbook?---ibroughtittoyou-----youwereinthereadingroomyesterday.whenifbecausebefore选哪

---where is the comic book?---i brought it to you -----you were in the reading room yesterday.when if because before 选哪个?
---where is the comic book?---i brought it to you -----you were in the reading room yesterday.
when if because before 选哪个?

---where is the comic book?---i brought it to you -----you were in the reading room yesterday.when if because before 选哪个?
when

选when.when引导的是时间状语从句,

when
显然发问者不知书在哪儿,由此可知第二人送书时他不在,同时可知这是一个时间状语从句,只能选when