Mr.smith collected stamps 8 years ago用过去进行时改写
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Mr.smith collected stamps 8 years ago用过去进行时改写
Mr.smith collected stamps 8 years ago用过去进行时改写
Mr.smith collected stamps 8 years ago用过去进行时改写
Mr smith was collecting stamps at the time 8 years ago
Mr Smith was collecting stamps 8 years ago