went是go的过去式，go on to do和doing区别 1、goondoingsth．表示动作做短暂停顿后，继续做同一件事，与goonwithsth 2、goontodosth.意为“接着再做另一件事...
all at once 突然； 例句 All at once there was someone knocking on the door. 突然有人敲门。 Mary thought of something all at once. 玛丽突然想到了...
keep后面是加doing。keep doing sth（一直做某事）。例句Keep doing the same thing over and over again（总是重复的做同一件事）。 keep doing例句If marr...
