Where _did__you _study___ (study) before you came here.为什么是did和study?
问题描述：
Where _did__you _study___ (study) before you came here.为什么是did和study?
答
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”.