My parents ________ in the countryside, but now they ________ in town.
A.used to live; are used to live
B.used to live; are used to living
C.are used to living; used to live
D.used to live; use to living
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B解析used to do sth．意思是过去常常；be used to doing sth．意思是习惯于，可用于各种时态。