If you happen to ________ my los

If you happen to ________ my lost papers while you’re looking for your book, please let me know at once by telephone.
A、come across
B、come up
C、come to
D、properly
【正确答案】：A
【题目解析】：如果你碰巧遇到我丢失的文件当你正在寻找你的书,打电话请立即让我知道。