The young man was often seen -C---- by the lake.

试题就是考see sb do 的结构1）感官动词see,watch,smell,notice等在主动语态时后接动词do或者doingsee sb do sth-------------被动式为sb be seen to do。see sb doing--------------被动式为sb be seen doing。 see sb do sth表示“看见某人做了某事”,强调看到某人做完了某事（强调结果） see sb doing sth表示“看见某人正在做某事”,强调某人正在做某事(强调过程)比较下列两句：I saw him repair his bike。 我看见他修了他的自行车。（他已修完了自行车）I saw him repairing his bike。 我看见他正在修他的自行车。（强调看见正在修车）2） 所以题目The young man was often seen ____ by the lake。 换成主动态： He often saw the young man____by the lake。显然主动态应该填 draw,句子强调的是看见动作的结果,而不是过程。被动态就为： be seen to do ,自然选A