_____last week.a.in the end of b.by the end of.at the end ofwhen did you come back to shool?

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_____last week.a.in the end of b.by the end of.at the end ofwhen did you come back to shool?
_____last week.a.in the end of b.by the end of.at the end of
when did you come back to shool?

_____last week.a.in the end of b.by the end of.at the end ofwhen did you come back to shool?
这个,没有上下文啊.
如果是完成时,选B
过去时,选C
A不对.
如果是这样的话,应该选C
at加具体的时间点.

C吧 at the end of
这是固定短语

at the end of last week 在上周的末尾 句子是过去式用这个
by the end of last week 到上周为止 如果句子是过去完成时就选这个