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Where ____ you sister go yesterday?填was还是did?

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Where ____ you sister go yesterday?填was还是did?
为什么what were you doing when Liu Xiang won the game?要用were?
did 后面有实意动词 go
要用 助动词 帮助提问
再问: 那为什么what were you doing when Liu Xiang won the game?要用were?
再答: 过去进行时 构成是 was were +动词ing 所以用were