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单选题
Scientists should be kept _________ of the latest developments in their research areas.
A
inform
B
informing
C
informed
D
to inform
答案解析
正确答案：C
解析：
参考解析:分词用法。分词的用法一般是现在分词表主动，过去分词表被动。本题中动词和主语的关系是:科学家是被告知的对象，是动作的接受者，所以要用被动形式，因此选过去分词informed。A项是动词原形，时态不符;B项informing语态不对;keep后面一般不用不定时，所以D项也不正确。句意:科学家们要通晓他们所在研究领域的最新发展。
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