IPv6 is currently in growing deployment around the world,( ) Internet address registries(RIRs)began to urge all resource mana

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问题 IPv6 is currently in growing deployment around the world,(    ) Internet address registries(RIRs)began to urge all resource managers to plan rapid adoption and conversion.

选项 A、from
B、since
C、for
D、over

答案B

解析 本题翻译为:
当前,IPv6正在全世界呈增长式发展,(    )因特网地址注册(RIRs)开始(过去式)推进所有的资源管理者对于快速引用和转变做出计划。
A.从  B.自……以来  C.为了,因为  D.在……之上
从意思上看,后者发生在前者的前面,且是前者的原因,因此选B。
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