________reading the letters,he was pleased to tell me that he would leave for France the next week为什么用On?

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________reading the letters,he was pleased to tell me that he would leave for France the next week为什么用On?

________reading the letters,he was pleased to tell me that he would leave for France the next week为什么用On?
________reading the letters,he was pleased to tell me that he would leave for France the next week
为什么用On?

________reading the letters,he was pleased to tell me that he would leave for France the next week为什么用On?
on 表示:在.之后,或一.
一读完那些信,他就高兴地告诉我,他下周就要去法国了