改错 At a time,some of our classmates were lost in playing computer games.

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改错 At a time,some of our classmates were lost in playing computer games.
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改错 At a time,some of our classmates were lost in playing computer games.
改错 At a time,some of our classmates were lost in playing computer games.

改错 At a time,some of our classmates were lost in playing computer games.
At one time 曾一度
这样就和后面的 were lost in.时间一致了
请及时采纳,不懂继续问( 天天在线 ）

a --> one