The children went back home from the grammar school, their lessons for the day.
A. finishing
B. had been finished
C. finished
D. had finished
网友回答
A. finishing
B. had been finished
(答案→)C. finished
D. had finished
解析：考查独立主格结构。分析题目结构可以看出，“their lessons for the day”部分不能是句子，因为前后都没有连接词。所以空格处应填入过去分词，表示被动和完成意义。“their lessons finished for the day”构成的是独立柱个结构，在句中作状语。