I saw him ___the key ___the lock,turn it and open the door A.pointing；in B.put; in C.putting ;toD.point ;to

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I saw him ___the key ___the lock,turn it and open the door A.pointing；in B.put; in C.putting ;toD.point ;to
I saw him ___the key ___the lock,turn it and open the door A.pointing；in B.put; in C.putting ;to
D.point ;to

I saw him ___the key ___the lock,turn it and open the door A.pointing；in B.put; in C.putting ;toD.point ;to
C see sb doing sth 看见某人正在做某事（see sb do sth 看见某人做某事的全过程）
the key to the lock 固定用法 类似的还有 the answer to the question

put,in
put是一个省掉to的动词不定式，是及物动词see的复合宾语。see后面的不定式必须要省掉to,这是语法规则。
从整个句子看，就是一个普通的一般过去时。用动词不定式是地道用法。选putting则是误人子弟,怎么能被选为满意答案呢？

B

I saw him ___the key ___the lock,turn it and open the door A.pointing；in B.put; in C.putting ;toD.point ;to While(cross)___the street.I saw someone waving to me. this is the man_____last nightAwhom I saw him Bwho I saw Cwhich I saw Dwho I saw him i saw him ____(walk)into the I saw him go out just now. I saw him ____ into that room. I saw him in the street是什么意思 I saw him go 什么 the classroom I saw him dancing.改为被动语态 i saw him yesterday改为否定句 I never saw him again翻译 I saw him go out.为什么不能写I saw him went out I saw him yesterday afternoon=I saw him in the afternoon yesterday吗 I saw him before going home.的同义句I saw him ___ ___ ___home. I saw saw saw 60页7.I saw him -----the key -----the lock ,turn it and open the door A. pointing ,in B.put ,in C.putting ,to D.point ,to 为什么 i saw him walk into the next room被动语态 I saw him yesterday afternoonA playing soccerB play soccer