答案：
d
这是完成时态的过去分词短语,表示的时间发生在谓语动词sent an email 之前,解释说明原因,作状语.
翻译：因为通过电话未能联系到他们,我们只好发了一封电子邮件.
____to reach them on the phone,we sent an email instead. A.F
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