作业帮Half an hour has passed since the train left请问,为什么要用现在完成时,想说明什么?
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Half an hour has passed since the train left请问,为什么要用现在完成时,想说明什么?
Half an hour has passed since the train left
请问,为什么要用现在完成时,想说明什么?
Half an hour has passed since the train left请问,为什么要用现在完成时,想说明什么?
强调火车离开对现在的影响（可能浪费了半小时等车 - -!)
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