题目内容：
For school officials, best-friend bond can be troublesome partly because it may result in cliques or bullying.参考答案：
答案解析：
单选题：For school officials, best-friend bond can be troublesome p
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阅读下面材料，回答题： A Best Friend? You Must Be KiddingA. From the ti
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Passage TwoQuestions 20 to 22 are based on the passage you h
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Why has P300 not been used by law enforcement in even one c
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