While cleaning a long-deserted house the other day I came ______

While cleaning a long-deserted house the other day I came ______ an old photo of my grandpa.
A、to
B、by
C、across
D、with
【正确答案】：C
【题目解析】：come across 偶遇，无意中发现句意：前几天我在打扫一所废弃已久的房子时，偶然发现了一张我爷爷的老照片。