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  3. If something happens once in a blue moon, how often does it happen?

If something happens once in a blue moon, how often does it happen?

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问题 If something happens once in a blue moon, how often does it happen?
选项 A、Occasionally
B、Very rarely
C、Only once.
D、Often.
答案B
解析 once in a blue moon俚语，用来形容千载难逢的，极其少见的。故选B。
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本试题收录于： D类竞赛（专科）题库大学生英语竞赛（NECCS）分类
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