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21、Lots of rescue workers were working around the clock, _______ supplies to Yushu, Qinghai Province after the earthquake．

A．sending          B．to send           C．having sent         D．to have sent

21、A

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Lots of rescue workers were working around the clock,       supplies to Yushu, Qinghai Province after the earthquacke.

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Lots of rescue workers were working around the clock,              supplies to Yushu, Qinghai province after the earthquake．．．．

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       C．having sent             D．to have sent

 

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B. to send
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B. to send
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Lots of rescue workers were working around the clock,              supplies to Yushu, Qinghai province after the earthquake．．．．

       A．sending                B．to send           

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