请用“专注，少即是多”解释苹果为什么能够屹立不倒？
查看答案
I________(已经收到) your e-mail of Aug.17th.
I’m glad to receive__________ (你的电子邮件).
I’m very sorry for I didn’t ______________ (早点回复你的邮件).
This e-mail is to___________ (告知你) that I’m thinking about studying in the U.S. next year.
微信支付 
支付宝支付