题目内容：

[单选题]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.(71)

A．too

B．so

C．very

D．much(72)

A．full

B．lost

C．inundated

D．filled(73)

A．more than

B．than

C．that

D．which(74)

A．manage

B．save

C．backup

D．dispose of(75)

A．toomany

B．redundant

C．long

D．trivial