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—Our classroom _____________ every day.
—So it is. It’s our duty to keep it clean and tidy.

A．cleanedB．cleans
C．is cleaningD．is cleaned

D

解析試題分析：句意：我們的教室每天都被打掃。確實如此。保持教室的干凈整潔是我們的職責。物作主語應該用被動，被動語態(tài)的結構是：主語+be+動詞的過去分詞，clean的過去分詞為cleaned，故選D。
考點：考查被動語態(tài)。

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