问题描述：
It ’ s time for me ____ (leave) for Beijing.适当的形式填空
There ___ (be) a few books and a pen on the desk.I can hear her ___(sing) in the next room now.What kind of work do you use the machine ___ (do)?
There ___ (be) a few books and a pen on the desk.I can hear her ___(sing) in the next room now.What kind of work do you use the machine ___ (do)?
问题解答：
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