Next door to ours , who has achieved much in physics.
A. where lives an old scientist
B. where does an old scientist live
C. lives an old scientist
D. does an old scientist live
网友回答
A. where lives an old scientist
B. where does an old scientist live
(答案→)C. lives an old scientist
D. does an old scientist live
解析：考查倒装。A陪同前往；B患；C经历；D从事。句意：刘先生出身于一个贫穷家庭，当还是个孩子的时候吃了很多苦。故C正确。