问题
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
B: to send
C: having sent
D: to have sent
正确答案是：
同类题型
The new law has come into effect, and number of wild animals here is on____increase now.
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You ______have written such a long articleThe teacher said 100 words would be enough