◎ 题干
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
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“Father _____ for London on business upon my arrival, so I didn't see him. [ ]A. has leftB. left C. was leaving D. had left …”主要考查了你对  【过去完成时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。