(1)What__your sister__at four yesterday afternoon昨天下午四点你妹妹在做什么?

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(1)What__your sister__at four yesterday afternoon
昨天下午四点你妹妹在做什么?

What did your sister do at four yesterday afternoon

What was your sister doing at ......
此句中有four四点钟这个明确时间,所以要用过去进行时

what are your sister doing at four...