He ______ when the UFO arrived. He didn'
题型:选择题
问题:
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
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