1。hear作为行为动词听见时,hear sb. do sth.与hear sb. doing sth. 有什么区别,分别怎么用?2。hear作为行为动词听说时,怎么用?例如:(A)I heard she __________on a trip yesterday morning.A.went B.go C.going为什么选A不好意思,请问怎么知道是丛句呢?