He _____ when the UFO arrived.         
A. was sleeping   B. were sleeping       C. has slept
A
考查時(shí)間狀語從句。句意“當(dāng)UFO來時(shí),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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