down the radio. The baby’s sleeping in the next room.A. TurningB. To turnC. TurnD. Turned

问题补充：

down the radio. The baby’s sleeping in the next room.

A. Turning

B. To turn

C. Turn

D. Turned

答案：

A. Turning

B. To turn

(答案→)C. Turn

D. Turned

解析：祈使句用动词原形开头。句意为：把收音机调低音量，孩子们在隔壁睡觉。