have seen 和seen的差别是什么?（急!）— He can't find his hat.Have you seen it?— Yes,of course.I _____ it on his bed just now.[ ] A.saw B.have seen C.had seen D.to see

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have seen 和seen的差别是什么?（急!）— He can't find his hat.Have you seen it?— Yes,of course.I _____ it on his bed just now.[ ] A.saw B.have seen C.had seen D.to see
have seen 和seen的差别是什么?（急!）
— He can't find his hat.Have you seen it?— Yes,of course.I _____ it on his bed just now.[ ] A.saw B.have seen C.had seen D.to see

have seen 和seen的差别是什么?（急!）— He can't find his hat.Have you seen it?— Yes,of course.I _____ it on his bed just now.[ ] A.saw B.have seen C.had seen D.to see
A.问题里是Have you seen,那你回复里也跟著用 have seen 就好了
如果对方问你 Did you see it?那你回答 I saw it on his bed 也可以
seen 是从 see > saw > seen 来的,

答案是A
差别要看你怎么用，举个例我才能回答你啊 :)

had ever seen和have ever seen的区别 i have seen the film already 和i have already seen the film的区别 have you seen的意思 have seen had seen的区别急要啊 Have you seen my pen anywhere?和Have you seen my pen somewherewhere?哪一个是对的 Never have I seen him before和Never before have I seen him 是一样的吗 seem和seen的区别 can be seen 和 can been seen 的区别? once to be seen 和once being seen的区别 have seen的延续性动词是什么? I have even seen 的意思是什么 I have even seen 的意思是什么 i have seen it Oh,I have seen have you seen anything Have you seen John? have been seeing /have been seen/ have seen的用法.以及I was saw 和I saw的用法请说清楚过去时和完成时的用法. I have already seen the film.和 I have seen the film already.有何不同?