Ted and his sister were listening to the radio （at this time

Ted and his sister were listening to the radio （at this time Ted and his sister were listening to the radio (at this time They were listening to the radio at this time yesterday."(一般 As we were listening to zhe radio,someone knocked at the doo 是Was Jack and his sister at the library? 还是Were Jack and his he was listening to the radio at nine last night His brother was listening to the radio 对listening to the rad At that time the two countries were at war and his father wa The l_____ were listening to the lecture attractively at tha I'm sure that they were listening to the radio. they ____ __ The Reads----(not listen) to the radio at that time 请问应该是listening the radio 还是listen to the radio?