the students ______[not play] at that time yesterday.

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thestudents______[notplay]atthattimeyesterday.thestudents______[notplay]atthattimeyesterday.thestude

the students ______[not play] at that time yesterday.
the students ______[not play] at that time yesterday.

the students ______[not play] at that time yesterday.
the students were not playing at that time yesterday,
强调的是过去某一点发生的事情,所以是过去进行时.

didn't play