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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:因為沒有打通他們的電話,我們只好給他們發了一封電子郵件。句子的主語we和fail之間是主動關系,不能用過去分詞,故排除B項,而A項是動詞原形只能作謂語;C項不定式表目的;故D正確。

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