◎ 题干
____to reach them on the phone, we sent an e-mail instead.
A. Fail
B. Failed
C. To fail
D. Having failed
◎ 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“____to reach them on the phone, we sent an e-mail instead. [ ]A. Fail B. Failed C. To fail D. Having failed …”主要考查了你对  【现在分词的完成式】  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。