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