Ellie_______ listening to music when the teacher spoke to her.
查看答案
I was taking a nap when someone_______ the door.
A. knocked
B. knocks
C. knocking
What_______ you_______ when Mom cooked last night?
A. was; doing
B. were; doing
C. are; doing
She_______ looking when we crossed the road.
A. weren't
B. wasn't
C. didn't
I was_______ in class at 3:00 p.m. yeasterday.
A. to study
B. study
C. studying