单选题 Mr. Peters has been in love with his wife ______ they first met in 1997.
A. after B. until
C. while D. since

【正确答案】 D
【答案解析】[解析] 和＜have+p.p.＞形式的现在完成时最搭配的连词是表示“自从……之后”意思的D项since。