______our classroom twice a week is necessary.

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问题 ______our classroom twice a week is necessary.

选项 A、Cleaned
B、Clean
C、To clean

答案C

解析 考查非谓语动词不定式的用法。有些非谓语动词可作宾语、主语等语法成分。在本句,不定式作主语。所以,C项正确。
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