The doctor the boy and examined his back.A. turned downB. turned onC. turned toD. turned

问题补充：

The doctor the boy and examined his back.

A. turned down

B. turned on

C. turned to

D. turned over

答案：

A. turned down

B. turned on

C. turned to

(答案→)D. turned over

解析：turn over意思是:翻转;意思符合题意.