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What __they__(do)when I called you just now?

题目详情
What __they__(do)when I called you just now?
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答案和解析
were doing
when I called you just now 表示过去的某一个时间点
那个时候在做什么,要用过去进行时态
翻译:我刚才打电话给你的时候,他们在干吗?