◎ 题干
---Why is the classroom so dirty? 
--- Sorry, sir. It ______ yesterday. We forgot to do it.
A.doesn’t cleanB.didn’t cleanC.isn’t cleanedD.wasn’t cleaned
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“---Why is the classroom so dirty?--- Sorry, sir. It ______ yesterday. We forgot to do it. A.doesn’t cleanB.didn’t cleanC.isn’t cleanedD.wasn’t cleaned…”主要考查了你对  【被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。