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_______to reach them on the phone, we sent an email instead.

A. Fail            B. Failed             C. To fail          D. Having failed

D


解析:

句意:因为没有打通他们的电话,我们只好给他们发了一封电子邮件。句子的主语we和fail之间是主动关系,不能用过去分词,故排除B项,而A项是动词原形只能作谓语;C项不定式表目的;故D正确。

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