◎ 题干
—What a clean (干净的) room it is today!
—Oh, yes! Who _____ it?
[     ]
A. is cleaning        
B. will clean            
C. has cleaned      
D. had cleaned  
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—What a clean (干净的) room it is today!—Oh, yes! Who _____ it?[ ]A. is cleaningB. will cleanC. has cleaned D. had cleaned…”主要考查了你对  【现在完成时】  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。