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

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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