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Packet-switching wireless networks are preferable(71)when transmissions are(72)because of

题目

Packet-switching wireless networks are preferable(71)when transmissions are(72)because of the way charges are(73)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(74)for the(75)of time they use the network.

A.to

B.for

C.than

D.only

参考答案
正确答案:D