I wonder how he could ______ not handing in his math exercises yesterday, for his math teacher is always strict with his students.

A．get along with

B．get away with

C．get down to

D．get around

当有朋友给我发送邮件而我当时没在线，那么已发送的电子邮件将会（）

A.该邮件被丢掉并永远不再发送

B.因为超过时间，无法打开

C.退回给发信人

D.保存在服务器上