主语是I ,答案不可能是A（注：A是主语是第三人称单数时用）,没有正确答案,因为BOUGHT 不能与SINCE 短语连用,正确的答案是have had ,即
You have a nice watch . -Thank you.I(have had ) it since i got married.
加油!不明白再问!如果帮到你,请采纳,谢谢!