◎ 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. FailB. FailedC. To failD. 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。