【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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he park has been built and it will be open _____ three years
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京派、海派、新感觉派、左翼小说
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1927年至28年，茅盾创作了三部曲《蚀》，它由三个系列中篇组成?
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