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 ;to
D.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