The Greens _____ in Paris and now they _____ in China. They like China. [ ]

A. used to live; are used to living

B. are used to living; used to live

C. use to live; used to live

D. used living; used to living

在TD-SCDMA系统中，不同空间的用户（）复用频率、时隙码道和功率资源。