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怎样改成简单句或从句?Soonafterwards,theballoonbegantodescendanditlandednearanairfield.

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怎样改成简单句或从句?
Soon afterwards,the balloon began to descend and it landed near an airfield.

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答案和解析
Soon afterwards,the balloon,which began to descend,landed near an airfield.非限定性定语从句