Where _did__you _study___ (study) before you came here.为什么是did和study?

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Where _did__you _study___ (study) before you came here.为什么是did和study?
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Where _did__you _study___ (study) before you came here.为什么是did和study?
Where _did__you _study___ (study) before you came here.为什么是did和study?

Where _did__you _study___ (study) before you came here.为什么是did和study?
因为“came”用了过去时,前后句要保持一致,所以助动词用“do”的过去时“did”,句中有助动词,动词要用原型,所以用“study”.

来这之前在哪学习
STUDY 在问句里用原形 前面则用DID
对应的一般过去式是i studied in XX before i came here

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