问题
选择题
He ______ when the UFO arrived. He didn't wake until the UFO disappeared. [ ]
A. slept
B. was sleeping
C. was doing homework
D. was singing
答案
答案：B
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He ______ when the UFO arrived. He didn't wake until the UFO disappeared. [ ]
A. slept
B. was sleeping
C. was doing homework
D. was singing
答案：B