题目内容
桱ohn，will you please ______ the blackboard now? It's your duty．
桹K．
A．not clean B．not to clean C．to clean D．clean
答案：D
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题目内容
桱ohn，will you please ______ the blackboard now? It's your duty．
桹K．
A．not clean B．not to clean C．to clean D．clean