My sister with her boyfriend England. You can call her next week.
A. have gone to B. has gone to C. have been to
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解析：句意：我的姐姐和她的男朋友已经去了英国。你可以下周给她打电话。结合语境可知前文描述的是现在已经完成的动作，故用现在完成时态，本句中真正主语是my sister，with her boyfriend是伴随主语，选项AC描述曾经的状态，选项B强调过去的动作，故选B。