◎ 题干
I'm sorry that I have kept you            me so long.          
[     ]
A. waiting
B. waiting for
C. to wait
D. to wait for
◎ 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“I’m sorry that I have kept youme so long.[ ]A. waitingB. waiting forC. to waitD. to wait for…”主要考查了你对  【动名词】【动词短语】  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。