你好,同学
这句话是对的,即
You must have worked there a year ago, didn’t you?
翻译:一年前你一定在那儿工作,不是吗?
解析:反意疑问句中含有Must的情况主要有以下几种:
1)作为情态动词表“必须”,这时反意疑问句直接用mustn'/needn't
2)当must表示推测时又分以下几种情况:
a:对现在事实的推测,反意疑问句与must后面的动词呼应,如:
You must be joking,aren't you ?
b:对过去事实的推测,表示动作的时候用did 当助动词,表示状态时用was,如:
Mr Green must have been punished for his being rude at the meeting,didn‘t he ?
(格林先生一定因为昨天在会上鲁莽的行为被处罚了,是吗?) 被处罚表示一个动作
She must have been a policeman ,wasn't she ?
(她过去一定是个警察,是吗?) 是警察表示一种状态
对现在情况的推测,问句部分用主动词(do,be)一般现在时的适当形式。若是现在进行时,问句部分用现在进行时的适当形式表示。若是there be结构,问句用isn't/aren't there。如:
1)He must be there,isn't he?
2)He must have a big family,doesn't he?
3)He must be waiting outside,isn't he?
4)There must be some students in the room,aren't there?
对已发生的过去情况的推测,若陈述句谓语部分有“must have done”,而且有表示过去的时间状语,问句部分用didn't;若没有表示过去的时间状语,问句部分用haven't或hasn't。如:
1)They must have gone there last night,didn't they?
2)They must have arrived by now,haven't they?(根据by now来判断)
3)They must have been to the Great Wall,haven't they?
本题正符合:对已发生的过去情况的推测,若陈述句谓语部分有“must have done”,而且有表示过去的时间状语,问句部分用didn't,因为句中有表示过去的时间状语a year ago。
希望能帮到你,祝更上一层楼O(∩_∩)O
有不明白的请继续追问,可以详谈嘛(*^__^*)
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