--------,we usually watched TV.A.After I had done the dishes

选A
when 当...的时候 表示一个动作发生的时候,另一个动作发生或者正在进行.可以指较短的(一点)时间,也可指一段时间.
e.g.I)When he was at college,he could speak several foreign languages.
II) When the clock struck twelve,all the lights in the street went out.
as
1) 用于表示同一个人的两种动作交替进行,指“一边……,一边……”.
e.g.I)The girl dances as she sings on the stage.
II) He looked behind from time to time as he went forward.
2)表示两个同步发展的动作或行为,译为“随着……”.
e.g.I) As time went on / by,she became more and more worried.
II) As children get older,they become more and more interested in the things
around them.
3)表示两个短促行为或事件几乎同时发生.
e.g.I) I thought of it just as you opened your mouth.
洗完碗后,我们通常看电视