2. 外语
  3. Things were getting along well __________ (却冒出个意想不到的问题来).

Things were getting along well __________ (却冒出个意想不到的问题来).

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问题 Things were getting along well __________ (却冒出个意想不到的问题来).
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答案when a problem popped up
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大学英语六级

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