The use of the simple past tense is quite complicated and there is a common use of the simple past tense to express a mild tone.
英语中过去时态用法十分复杂，而过去时态表委婉客气是一种常见的用法。
The use of the simple past tense is quite complicated and there is a common use of the simple past tense to express a mild tone.
英语中过去时态用法十分复杂，而过去时态表委婉客气是一种常见的用法。
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