He up early since his childhood.
A. used to get
B. is used to getting
C. has been used to get
D. has been used to getting
网友回答
A. used to get
B. is used to getting
C. has been used to get
(答案→)D. has been used to getting
解析：考查时态和固定用法。根据since his childhood说明本句使用现在完成时。同时be used to sth/doing sth习惯sth/做某事；句意:自从孩提时期以来，他已经习惯了早起。故D正确。