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A large number of volunteer doctors have ___ Sichuan since t

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A large number of volunteer doctors have ___ Sichuan since the earthquake hit Ya'an.
A.moved to B.arrived in C.reached D.been in
Grandmother didn't like town life.But now she ___ in the town.
A.is used to living B.was used to living C.used to live D.is used to live
A large number of volunteer doctors have ___ Sichuan since t
答案是:DA
再问: 为?
再答: 1、since表示自从,主现完从过(延续性动词):have been in表示延续性 2、be used to ving 习惯于