The dominant language of e-mail is English. A traditional English letter usual
ly begins with an address, the date and perhaps the address of the addressee.
_____ the email system itself inserts theses things, is there any point in put
ting them in?
選項有What if But if As if Not if
我選What if 但答案是But if
Not if翻譯是如果...則不
他跟if not 有什麼差別嗎