题目内容
—Our classroom _____________ every day.
—So it is. It’s our duty to keep it clean and tidy.
| A．cleaned | B．cleans |
| C．is cleaning | D．is cleaned |
D
解析试题分析：句意：我们的教室每天都被打扫。确实如此。保持教室的干净整洁是我们的职责。物作主语应该用被动，被动语态的结构是：主语+be+动词的过去分词，clean的过去分词为cleaned，故选D。
考点：考查被动语态。
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