He _____ when the UFO arrived.         
A. was sleeping   B. were sleeping       C. has slept
A
考查時間狀語從句。句意“當UFO來時，他正在睡覺�！県e是第三人稱，故謂語用單數(shù)，排除B；根據(jù)arrived可知，用過去式，排除C。故選A。
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