◎ 题干
The letter I have been looking forward to _______.

[     ]

A. arrive
B. has arrived
C. arriving
D. arrival

◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The letter I have been looking forward to _______. [ ]A. arrive B. has arrived C. arriving D. arrival …”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。