The major problem with E-mail is that it i
题型：单项选择题
问题：
The major problem with E-mail is that it is (71) easy to use that people can become (72) with messages (73) they can possibly answer in a day. In addition, mail boxes require some management to (74) messages or archive those that might be required later. Senders don’t always know about your E-mail backlog and often send (75) messages.
A．too
B．so
C．very
D．much
