I ( ) go out when someone knocked at the door.A.was to B.was going to C.was about to

问题描述:

I ( ) go out when someone knocked at the door.
A.was to B.was going to C.was about to

c吧 be about to ...when ...是句型表示将来时 "正准备要做"的意思
其他的可用排除法