Although invitations are usually sent through the mail, informal

Although invitations are usually sent through the mail, informal invitations such as e-mails and phone invitations are becoming more acceptable.

A.虽然邀请函通常被邮件发出去.但非正式邀请和电子邮件、电话邀请等越来越被普遍使用。

B.虽然邀请函通常通过信函方式发出.非正式邀请和电子邮件、电话邀请等越来越被普遍使用。

C.虽然邀请函通常通过信函方式发出.像电子邮件、电话邀请等非正式邀请越来越被普遍使用。

D.虽然邀请函通常通过信函方式发出.但目前像电子邮件、电话邀请等非正式邀请越来越被普遍使用。

正确答案是D