______ to reach them on the phone, we sent an email instead.
A.FailB.FailedC.To failD.Having failed在线课程D
考查非谓语动词作状语的用法。由句意可知前半句在整个句子中作时间状语。A项,动词原形不能作状语;B项过去分词表示fail和主句主语we是被动关系,不合逻辑;C项不定式作状语放在句首只能表目的;而D项Having failed是ing形式的完成时态主动语态,表示这一动作先于主句动作sent发生。本句意为“在与他们电话联系失败之后,我们改发了电邮。”
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