Father for London on business upon my arrival so I didn’t see him.A. has leftB. leftC. wa

问题补充：

Father for London on business upon my arrival, so I didn’t see him.

A. has left

B. left

C. was leaving

D. had left

答案：

A. has left

B. left

C. was leaving

(答案→)D. had left

解析：正确答案D。

难点1.leave for... 意为：出差到...

难点2. upon my arrival相当于when I arrived，是句子的状语

“父亲去伦敦出差”这一动作在“我到达”之前已经发生，故“我没见着他”。

某个动作或过程在过去的过去已经完成，与现在没有联系;而且过去完成时有一个与一般过去时动作的先后。