His son, who left him more than 20 years ago, came back out of the blue. The underlined part means ______.

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问题 His son, who left him more than 20 years ago, came back out of the blue. The underlined part means ______.

选项 A、unhappily
B、unexpectedly
C、untidily
D、unofficially

答案B

解析 out of the blue表示“未经事先告知地,突如其来地”,B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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