问题补充:
I met my old friend on my way home from school.
A. by chance
B. on accident
C. by sudden
D. on occasion
答案:
(答案→)A. by chance
B. on accident
C. by sudden
D. on occasion
解析:考查介词短语:A. by chance偶然,B. on accident介词应该是by,也是“偶然地”,C. by sudden突然D. on occasion有时,间或。句意:在我放学回家的路上遇到了一个老朋友。选A。