He _____ when the UFO arrived. A. was sleeping B. were sleeping
题型：不详难度：来源：
He _____ when the UFO arrived.
A. was sleeping B. were sleeping C. has slept |
答案
| A |
解析
| 考查时间状语从句。句意“当UFO来时，他正在睡觉。”he是第三人称，故谓语用单数，排除B；根据arrived可知，用过去式，排除C。故选A。 |
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