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

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

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

B if 意思是dale 问我老师从上海回来木有
如果是when 应该写成Dale asked me when our teacher would come back from shanghai.

fuck