How dirty the windows are! They really require . A. to clean B. being cleaned C. to have cleaned D. cleaning 【查看更多】

 

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How dirty the windows are! They really require _______.

A. to clean   B. being cleaned    C. to have cleaned    D. cleaning

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How dirty the windows are! They really require _______.

A．to clean

B．being cleaned

C．to have cleaned

D．cleaning

 

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