My cousin used to online too late but now she is used to to bed early.A. chat; goB. cha

问题补充：

My cousin used to online too late, but now she is used to to bed early.

A. chat; go

B. chatting; go

C. chatting; going

D. chat; going

答案：

A. chat; go

B. chatting; go

C. chatting; going

(答案→)D. chat; going

解析：句意：我的表妹以前上网到很晚，但是现在她习惯于早睡了。be used to doing sth 习惯于做……，used to do sth,过去常常做某事。根据结构和句意，故选D。