中文谷Lotsofrescueworkerswereworkingaroundtheclock，
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問題詳情：
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
【回答】
A
知識點：非謂語動詞
題型：選擇題
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