◎ 题干
I'm very sorry to keep you______ for a long time.
[     ]
A. waiting    
B. to wait      
C. waited      
D. wait
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“I'm very sorry to keep you______ for a long time.[ ]A. waitingB. to waitC. waited D. wait…”主要考查了你对  【动名词】  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。