句子改错:
问题描述：
句子改错:
I read a history book when someone knocked at the door.
What did you do at ten o'clock last Sunday morning.
While the alien was in the museum ,I was calling the TV station.
意思不用,只要改正错误的地方...急用!
答
1 去掉at
2 what were you doing at ten o'clock last Sunday morning.
3 while Alien was in the museum ,I was watching the TV station.