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聽課中的錯題能自動加入錯題本，課后可方便復習及導出錯題本升級服務(wù)
在線答疑、課后同類題練習、講義下載、短信提醒Then，in the spring of 1858，John got sick and died.He was buried in a cemetery in Edinburgh，Scotland.After John was buried，Bobby stood at John’s grave and cried.“Come on，Bobby，”friends said.“It’s time to go home.”Bobby went home，but later he returned to the cemetery.He sat down near John’s grave.He stayed there all night.
Bobby stayed at the cemetery the next day，and the next day，and the next.For the next 14 years，Bobby never left the cemetery.When the weather was cold or rainy，he slept in a small house at the cemetery.When the weather was warm，he slept on the ground near John’s grave.
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