I saw him _____(进入)the Building A yesterday afternoon but he didn’t come out.

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I saw him _____(进入)the Building A yesterday afternoon but he didn’t come out.

I saw him “entering” the Building A yesterday afternoon but he didn’t come out.

1. see sb. do sth. 看见某人经常做某事或做过某事.
2. see sb. doing sth. 看见某人正在做某事.