问题
选择题
He _____ when the UFO arrived.
A. was sleeping B. were sleeping C. has slept
答案
答案：A
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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He _____ when the UFO arrived.
A. was sleeping B. were sleeping C. has slept
答案：A
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。