He a machine the last time I saw him. [ ] A.operatedB.was operating C.was operat
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![He a machine the last time I saw him. [ ] A.operatedB.was operating C.was operat](/pic/43_960419.jpg)
He ________ a machine the last time I saw him.
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A.operatedB.was operatingC.was operating onD.operated on试题答案
答案:B
![He a machine the last time I saw him. [ ] A.operatedB.was operating C.was operat](/pic/43_960419.jpg)
He ________ a machine the last time I saw him.
[]
A.operatedB.was operatingC.was operating onD.operated on答案:B