Question

He _____ when the UFO arrived.         
A. was sleeping   B. were sleeping       C. has slept

Answer 1

A

考查時(shí)間狀語從句。句意“當(dāng)UFO來時(shí)，他正在睡覺。”he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。