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They have ______ their homework already.

A.finish B.finishes
C.finished D.finishing

C

解析试题分析:句意:他们已经完成了他们的家庭作业。finish 完成,是一个动词。finishes 第三人称单数;finished 过去式或过去分词;finishing 现在分词。根据句意和句中的already可知,这句话中应该使用现在完成时,have +动词的过去分词。故选C。
考点:考查动词。

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