He was half asleep he suddenly heard someone knocking at the door. [ ] A.whileB.
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![He was half asleep he suddenly heard someone knocking at the door. [ ] A.whileB.](/pic/43_977635.jpg)
He was half asleep________ he suddenly heard someone knocking at the door.
[]
A.whileB.whenC.asD.then试题答案
答案:B
![He was half asleep he suddenly heard someone knocking at the door. [ ] A.whileB.](/pic/43_977635.jpg)
He was half asleep________ he suddenly heard someone knocking at the door.
[]
A.whileB.whenC.asD.then答案:B