问题
选择题
I know Beijing very well since I ________ there three times.
A. have been B. went C. have gone
答案
答案：A
题目分析: 句意：我非常了解北京，因为我去了那三次。since因为，three times三次，用于现在完成时，have
been to去某地已经回来了，故选A.
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