B,前后一致,ran----left这是过去时态
过去完成是强调在过去的时间段内完成的动作 I had finished the work by yesterday morning.
现在完成是强调到现在为止完成的动作 I have done all the work today.
B,前后一致,ran----left这是过去时态
过去完成是强调在过去的时间段内完成的动作 I had finished the work by yesterday morning.
现在完成是强调到现在为止完成的动作 I have done all the work today.