--Since when ________ each other --Oh I can't remember.A.did you know B.do you know C.you know D.have you known

since when She won’t leave _______ her friends come back.since until when The book was written in 1946,_______ the education system has witnessed great changes.A.when B.during which C.since then D.since when It is more than six months now _______ she left home and it will be another three days _______ she returns home.A. since; fromB. since; beforeC. before; whenD. when; since since then &since whenThe book was written in 1946,_______ the education system has witnessed great changes.A.since when B.since then 为什么选A不选B? 翻译Since when was this when和since的用法 since when ,how long 区别 _______ you can't answer this question,we have to ask someone else.A.While B.Before C.When D.since I was walking along the street _______ I met a friend of mine.A.while B.when C.as D.since 要原因 ---Yao Ming got his left ankle injured and has not played since.---When was _______?---Yao Ming got his left ankle injured and has not played since.---When was _______?---_____ was on Nov.10th when Houston Rockets beat Washington Wizards.A.that; It B --- When did you get your first pair of skates?--- _______.--- When did you get your first pair of skates?--- _______.A.For 6 years B.Since I was 7 years old C.When I was 7 years old D.Since 6 years ago as/since/until/when/while的区别 as when while since的区别 when和since有既然的意思, when while since 的区别,及用法 since when引导定语从句的用法? since,after,when before的区别