What did you buy yesterday morning中,为什么buy后不能加on?急

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What did you buy yesterday morning中,为什么buy后不能加on?求解,急
因为在【this/that/next/last/yesterday/tomorrow等】+【时间的名词短语】前通常【不用介词】.

What did you buy yesterday morning中,为什么buy后不能加on?急 where did you buy yesterday 为什么buy不用过去式连词成句yourself,did,buy,what,yesterday,you,for, 1. what ________you (buy) yesterday morning? What did you buy last What snacks do you buy yesterday?改错 what did you do yesterday morning? what did you talk with yesterday morning? 英语翻译为什么是where did you buy this?而不是where you buy this?为什么要加DI where did you buy it yesterday哪错了 Did you buy a can of cola yesterday what ____ did your father buy for you on your birthday?A new