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

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

he finished ( )his homeworkat 10 o'clock last night.to do,did,doing,do,为什么选c
doing
注:finish doing sth 固定用法

finish +doing 完成做某事。
所以选c

finished doing sth 完成某事
是一个固定搭配。