Packet-switching wireless networks are preferable(41)when transmissions are(42)because of the way charges are(43)per packet. Cir

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问题 Packet-switching wireless networks are preferable(41)when transmissions are(42)because of the way charges are(43)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(44)for the(45)of time they use the net-work.

选项 A、to
B、for
C、than
D、only

答案D

解析
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