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?急

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

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