The doctor spent nine hours on the eye of the wounded soldier. [ ] A.to operateB
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![The doctor spent nine hours on the eye of the wounded soldier. [ ] A.to operateB](/pic/43_987973.jpg)
The doctor spent nine hours ________ on the eye of the wounded soldier.
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A.to operateB.operatingC.in operatingD.both B and C试题答案
答案:B