【单选题】【消耗次数：1】
Tom has been a vegetarian ____ principle for years.
①
in
②
on
③
for
④
by
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相关题目
【单选题】
he park has been built and it will be open _____ three years
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A. in
②
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The professor has been [填空]at the university for over thirty years.
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③
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随机题目
【单选题】
下列有关领导工作的说法中，不正确的是（）。
①
领导工作综合性、系统性强
②
领导干部加强现代知识的扩充和更新，十分必要，也十分迫切
③
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④
领导工作需要多方面的知识积累