jack sits beside the window and ------------of it from time to timea looks b looks after c looks at d looks out

jack sits beside the window and ------------of it from time to timea looks b looks after c looks at d looks out
jack sits beside the window and ------------of it from time to time
a looks b looks after c looks at d looks out

jack sits beside the window and ------------of it from time to timea looks b looks after c looks at d looks out
应该选择d.
我的答案怎么样?