Lotsofrescueworkerswereworkingaroundtheclock，suppliesto...

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