he were sleeping when the UFO arrived.为什么用were
人气：384 ℃ 时间：2019-09-01 00:58:41
解答
因为当UFO到达时用的是arrived 可以看出是一般过去时 所以前面的他正在睡觉 很显然也应该与后面的arrived保持一致 用了were sleeping 过去进行时
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