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：考查过去完成时，句意是：他爸爸告诉我他三天前去了美国。说明在他爸爸告诉我前他去了美国，用过去完成时，和过去完成时连用表示“三天前”用three days before，表示过去某个时间前的三天，选D。