_________to reach them on the phone, we sent an email instead.
A．FailB．FailedC．To failD．Having failed
D
句意：因為沒有打通他們的電話，我們只好給他們發(fā)了一封電子郵件。句子的主語we和fail之間是主動關(guān)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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