He ______when the UFO arrived. He didn’t...

He ______when the UFO arrived. He didn’t wake until the UFO disappeared.

A．slept

B．was sleeping

C．was doing homework

D．was singing

B 【解析】由下文句意“当UFO消失时他才醒来”可知前句意为“当UFO到达时他正在睡觉”。过去某一时刻正在做某事，用过去时行时。故选B。

考点分析：

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