The teacher told me that the students I wanted to see were seen___ football on the playground just now. A playing B to be playing C play D to play为什么D不可以
问题描述：
The teacher told me that the students I wanted to see were seen___ football on the playground just now. A playing B to be playing C play D to play
为什么D不可以
答
这道题选A吧，感官动词一般没有加to do的用法。see sb. doing,看见某人正在做某事：I saw him reading the novel.see sb. do指过去或经常被看到做某事。如：You can see her read the novel every afternoon.
答
be seen doing表示被看到的时候他们正在做某事（进行时）
而be seen to do表示被看到做了某事（非进行时）
刚刚被人看到他们在操场踢足球，一定是被看到的时候正在踢足球，所以要用be seen doing
答
the students I wanted to see were seen是被动,首先恢复成主动saw the students I wanted to see词组是see sb+do /doing sthjust now表明只是某一个时间点看到,应用see sb doing sth而D to play是see sb do 的被动,...