We clean our classroom every day．Now it________．So it looks very clean．A.is cleanedB.is being cleanedC.has cleanedD.has been cleaned
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D解析分析：it指教室，和clean之间是被动关系，所以要用被动语态。A，B，D都是被动语态。A项is cleaned是一般现在时，表示经常性情况，B项is being cleaned是现在进行时，表示现在正在进行的情况，D项has been cleaned是现在完成时，表示对现在有影响。So it looks very clean应该看成是前面一句对现在的影响，所以要用D项。