问题补充：
After he was promoted to the present position, he is not so hardworking as he .
A. was used to
B. used to be
C. was used to being
D. used to
答案：
A. was used to
(答案→)B. used to be
C. was used to being
D. used to
解析：考查的是不定式的省略。as后面引导的是比较状语从句，且该从句存在省略，即：he is not so hardworking as he used to be hardworking= he is not so hardworking as he used to be。句意：在他被晋升到目前的职位后，他不再像他过去那样勤奋了。
