问题

I_______ my homework when the door bell__________.
A:did, rang
B:was doing, was ringing
C:did, was ring
D:was doing, rang
B:was doing, was ringing
C:did, was ring
D:was doing, rang
正确答案是:
同类题型
After finishing middle school, my sister did nothing ____ at home.
Shandong lies _______ the east of China and Japan lies_______ the east of China,too.[ ]
Do you often go to movies _____ your parents _____weekends?[ ]
A computer is very popular and helpful .— I think so. It _______ in many different fields.
I like the teacher__________classes are very interesting and creative.