He _____ when the UFO arrived.         
A. was sleeping   B. were sleeping       C. has slept
A
考查時(shí)間狀語(yǔ)從句。句意“當(dāng)UFO來(lái)時(shí)，他正在睡覺(jué)。”he是第三人稱，故謂語(yǔ)用單數(shù)，排除B；根據(jù)arrived可知，用過(guò)去式，排除C。故選A。
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