he finished ( )his homeworkat 10 o'clock last night.to do,did,doing,do,为什么选c

问题描述:

he finished ( )his homeworkat 10 o'clock last night.to do,did,doing,do,为什么选c

finished doing sth 完成某事
是一个固定搭配。

finish +doing 完成做某事。
所以选c

doing
注:finish doing sth 固定用法