Last Sunday she came to visit us out of the blue. The italicized phrase means __________

A．unexpectedly

B．unhappily

C．untidily

D．unofficially

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【译文】上个星期天，她突如其来地拜访了我们。0ut of the blue这个短语和下面哪个单词同义?
【解析】考查固定用法和副词词义。out of the blue表示unexpectedly，without warning“未经事先告知地，突如其来地”，A与此含义一致。unhappily“不高兴地”；untidily“不干净地，不整洁地”；unofficially“非正式地”，均与题意不符。

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