試題就是考see sb do 的結(jié)構(gòu)
1）感官動(dòng)詞see,watch,smell,notice等在主動(dòng)語態(tài)時(shí)后接動(dòng)詞do或者doing
see sb do sth-------------被動(dòng)式為sb be seen to do.
see sb doing--------------被動(dòng)式為sb be seen doing.
 see sb do sth表示“看見某人做了某事”,強(qiáng)調(diào)看到某人做完了某事（強(qiáng)調(diào)結(jié)果）
 see sb doing sth表示“看見某人正在做某事”,強(qiáng)調(diào)某人正在做某事(強(qiáng)調(diào)過程)
比較下列兩句：
I saw him repair his bike. 我看見他修了他的自行車.（他已修完了自行車）
I saw him repairing his bike. 我看見他正在修他的自行車.（強(qiáng)調(diào)看見正在修車）
2） 所以題目The young man was often seen ____ by the lake.
換成主動(dòng)態(tài)： He often saw the young man____by the lake.
顯然主動(dòng)態(tài)應(yīng)該填 draw,句子強(qiáng)調(diào)的是看見動(dòng)作的結(jié)果,而不是過程.
被動(dòng)態(tài)就為： be seen to do ,自然選A