在线题库 [单选] Inmanycases,withoutdeliveryconfirmation,thesenderknowsthat somethingwassent,butthereisnoconfirmation___ whetherwasreceivedorwhenitwasreceived. 发布时间：2022-09-12 0次 A. in terms of B. as to C. in this regard 您需要登录才可以下载或查看，没有账号?会员注册
