◎ 题干
_____ your letter, I would have written back two days ago.
[     ]
A. If I received
B. Should I receive
C. Had I received
D. If I could have received
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“_____ your letter, I would have written back two days ago. [ ]A. If I received B. Should I receive C. Had I received D. If I could have received …”主要考查了你对  【部分倒装】【虚拟语气】  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。