题目内容

The children went home from the grammar school,their lessons___for the day.
A．finishingB．finished
C．had finishedD．were finished
B
their lessons finished for the day构成独立主格结构,独立主格结构是由一个相当于主语的名词或代词加上非谓语动词、形容词(副)词、或介词短语构成的一种独立成分。根据lesson与finish的关系可判断出要用动词+ed形式,表示被动。had finished和were finished都不是非谓语动词,所以不能构成独立主格结构。finishing是动词+ing形式,表示主动。
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