(给动词的适当形式填空)while her mother _____(put) Cathy to bed,the door bell____(ring)

问题描述:

(给动词的适当形式填空)while her mother _____(put) Cathy to bed,the door bell____(ring)

was putting
rang

while her mother was putting (put) Cathy to bed,the door bell rang (ring)