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

A．Fail B．Failed

C．To fail D．Having failed

D

【解析】

試題解析：句意：因?yàn)榻o他們打電話打不通，代替打電話我們發(fā)了郵件。強(qiáng)調(diào)非謂語動(dòng)詞fail的動(dòng)作在謂語動(dòng)詞sent之前發(fā)生，使用Having done。故選D。

考點(diǎn)：考查謂語動(dòng)詞

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