——Doctor, what do you think about the operation on my mom?
——Couldn’t be better．I’m sure she’ll recover .
A. one by one
B. side by side
C. by and by
D. by the by
网友回答
A. one by one
B. side by side
(答案→)C. by and by
D. by the by
解析：by and by不久，马上； side by side肩并肩地； one by one逐个地，一个接一个地； by the by 顺便提一下.从句意来看，C项适合。