His father told me that he for the United States three days .A. has left; agoB. had left;

问题补充：

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

答案：

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。