_____at the Town Hall,the Queen was welcomed by the Mayor.A.On reachingB.At arrivalC.On arrivalD.At reaching
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：_____at the Town Hall,the Queen was welcomed by the Mayor. A.On reaching B.At arrival C.On arrival D.At reaching因空格 后有at，排除a，d,on +名词或v+ing表示“一......就......”,这里选c,
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On arriving/arrival at...,means as soon as the queen arrived at ....On doing has the same meaning of as soon as
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选C.On arrival