单选题
She told me that she has already gone to the United States four times before she attended that conference.
【正确答案】
A
【答案解析】[解析] “已去过美国四次”(现在已回来)应用have been to，而不用have gone to。此外“去美国”(has already been to the United States)这一动作发生在“告诉”(told)之前，应用过去完成时had already been to。所以答案为A。