Lots of rescue workers were working around the clock, supplies to Yushu, Qinghai Province after the earthquacke.
| A．sending | B．to send | C．having sent | D．to have sent |
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Lots of rescue workers were working around the clock, supplies to Yushu, Qinghai Province after the earthquacke.
| A．sending | B．to send | C．having sent | D．to have sent |
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