Dale asked me ____our teacher had come back from Shanghai.A

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Dale asked me ____our teacher had come back from Shanghai.A when B if
为什么,讲理由

选B if
ask sb sth 后面需要链接一个名词性短语或句子.
而our teacher had come back from Shanghai 是一个完整的句子,可做ask 的宾语
if则可以引导一个选择性宾语从句的
如果had改成would 则选用when
再问：为什么用when，had就要改would ？？“？？是不是when不能引导什么，，，
再答：因为如果是had，when引导的时间状语从句，而句子中需要的是宾语从句。你看下意思理解就知道了要明确句子默认的前提意思：老师还没回来，还在上海。（用if： Dale问我老师是否已经从上海回来了？用when：则会是 Dale问我老师什么时候将会从上海回来？还没有发生肯定和had不符合，用would才能一致这样的话句子就应该是Dale asked me（the date做宾语同位语可省略） when our teacher would come back from shanghai。）希望你能讲清楚，对你有帮助，谢谢

Dale asked me ____our teacher had come back from Shanghai.A my teacher asked me to ____our school English speech contest 连词成句 Linda,Shanghai,from,will,back,tomorrow,come(.) When did your father come back home from Shanghai?___ How soon _____your father _____(come)back from Shanghai Linda Shanghai from will back tomorrow come排列顺序 when did your father come back from shanghai Our teacher come from shanghai否定句和一般疑问句和from shAnghai 划线提问 the teacher asked me to come in还是 came in she said she had just come back from holiday _________they come from Shanghai? Can you imagine the questions I had ____our teacher.