You should never base anything on a theory that _________ impractical in practic
题型：不详难度：来源：
You should never base anything on a theory that _________ impractical in practice. | A．is proved | B．prove | C．proves | D．proved |
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答案
| C |
解析
| 考查时态和语态。句意：你不应当基于任何一个不切实际的理论。prove作"证明是;结果是;事实说明"解时,用作连系动词，没有被动语态。结合语义可知定语从句描述的是客观存存在的事实，故用一般现在时态。逻辑主语a theory是单数，故谓语动词用单数，选C。 |
举一反三
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---.Great, and also the book review says Shakespeare ________ all his characters in the play vivid and alive.| A．made | B．makes | C．had made | D．has made |
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---Have you heard that Tom, as well as his parents, ________ moved to Beijing ?
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