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Did you see the UFO?When it ____(landed,was landing),I was in the barber' shop!填那个,

题目详情
Did you see the UFO?When it ____(landed,was landing),I was in the barber' shop!填那个,
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答案和解析
was landing
I was in the barber' shop!是一个点时间,所以要用进行时