万分火急！谢了。并说明一下原因。

A. the one ; repaired
因为是THIS WATCH，所以后面跟THE ONE，如果是THE WATCH，后面跟WHICH 或THAT。
HAVE STH. DONE :
如HAVE THE WATCH REPAIRED,表示让别人帮自己修表
HAVE SB. DO STH.让某人做什么
HAVE THE WATCH REPAIRED= HAVE SOMEBODY REPAIR THE WATCH

the answer should be D because Which is supporting watch, you don't need to mention "It" repaired because you already said Watch at the beginning.

答案是D,(其实我感觉D也不是很适合)
第一个空which you wish to 是watch的介词,用来修饰watch的,主语是watch,主谓语是 the watch have repaired.再看一下如果用the one,这里我们不要用问句,问句容易主导人,改成肯定语气:this is watch the one you wish to.....the one 在这里修饰不了watch,如果加个豆号,改成:this is watch,the ong you wish to....,那就没错.
第二个空,表已经修好,那是完成时,have+动词过去式,表自己是不会修的,应该用被动语态,所以应该是 have been repaired,

A