【单选题】【消耗次数：1】
下列脂环烃中最稳定的是：
①
环丙烷
②
环丁烷
③
环戊烷
④
环己烷
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①
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is to be
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There was a knock at the door. It was the second time someone ＿＿＿＿＿ me that evening.
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to have interrupted
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would have interrupted
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to interrupt
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relying
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