His father told me that he for the United States three days .
A. has left; ago
B. had left; ago
C. left; ago
D. had left; before
网友回答
A. has left; ago
B. had left; ago
C. left; ago
(答案→)D. had left; before
解析：考查时态。Three day ago三天前，与过去时连用；three days ago与过去完成时使用。可以：他的父亲告诉我在三天前他就去了美国。父亲告诉我已经用了过去时。去美国在他说之前，用过去完成时。故D正确。