With a question tag: They must have lost their way yesterday, _______?

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问题 With a question tag:
They must have lost their way yesterday, _______?

选项

答案didn’t they

解析 若陈述部分有must+have+v.一ed表示推测时,且句中有明显的过去时间状语,问句部分用过去体,即didn’t they,而不是mustn’t they。答案为didn’t they。
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