[文法] by that time/ at that time
請問by that time 和 at that time 有何不同??
在國中文法書看到
He was playing the piano at that time.
he had arrived at the station by that time.
應該要如何解釋呢??
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07/10 21:11, , 1F
07/10 21:11, 1F
→
07/10 21:11, , 2F
07/10 21:11, 2F
→
07/10 21:11, , 3F
07/10 21:11, 3F
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