◎ 题干
The exercises are extremely difficult, but half of the class_____ them ahead of time.   
 [     ]
A. has already finished    
B. will finish    
C. have already finished    
D. finishes
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The exercises are extremely difficult, but half of the class_____them ahead of time.[ ]A. has already finishedB. will finishC. have already finishedD. finis…”主要考查了你对  【现在完成时】【主谓一致】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。