问题详情

The major problem with E-mail is that it is (1) easy to use that people can become (2) with messages. (3) they can possibly answer in a day. In addition, mail boxes require some management to (4) messages or archive those that might be required later. Senders don"t always know about your E-mail backlog and often send (5) messages.
A．too
B．so
C．very
D．much请帮忙给出正确答案和分析，谢谢！