请说明为什么?I saw him ----the room,but I didn't know when he-----

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请说明为什么?I saw him ----the room,but I didn't know when he-----.
A going into；left there B go into；left there C going into； left to there D go into；left for there

B
看到的是他进入房间的过程,所以是do
二离开后的there是副词,所以不用for
再问：请问为什么不是 doing？
再答： see 后面可以接三种形式 1是do 2是doing 3是done saw him doing 表示的是看到的动作，比如说看到某人在唱歌，正在唱歌的意思。 saw him do 表示的是看到某人的整个全过程 see sb. doing表示动作未结束或还在进行 see sb. do表示动已经完成(或表示看到全过程) 像hear notice watch keep find get feel 这类感官动词都用于这种结构

请说明为什么?I saw him ----the room,but I didn't know when he----- peter didn't look well last year when i saw him.he ___ cigar I saw him ____ when I entren the room I didn't know him very well but I thought he might still be I didn’t know why he looked angry when I patted him ______. I didn’t know why he looked angry when I patted him ______.A I know him but he doesn’t know ( ) (I) 1.I saw him,but I didn't _____to him.A.say. -I saw Jim in the club.But he didn't speak to me _____evenin I ____(see)him,but he didn't see me I donn't know when my father___.But if he ___I'll tell him a I didn't know he came back___I met him in the street.