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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?yàn)闆]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(yǔ)we和fail之間是主動(dòng)關(guān)系,不能用過(guò)去分詞,故排除B項(xiàng),而A項(xiàng)是動(dòng)詞原形只能作謂語(yǔ);C項(xiàng)不定式表目的;故D正確。

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A.satisfied

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2.

A.a(chǎn) little

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16.

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A.laying

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