题目内容
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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