His grandfather ______ in the country, but he ______ in the city now. [ ]

A. used to live, is used to living

B. is used to live, used to live

C. used to live, used to living

D. is used to live, is used to living

TRH兴奋试验在Graves病时结果应为（）

A.TSH异常升高

B.TSH异常升高

C.TSH无变化

D.TSH降低

E.以上都不是