I met my old friend on my way home from school.A. by chanceB. on accidentC. by suddenD. o

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。