I ____ the radio before I went out yesterday.A.turn on B.turned on C.turn off D.turned off

问题描述:

I ____ the radio before I went out yesterday.A.turn on B.turned on C.turn off D.turned off

D 昨天我出去之前关掉了收音机
turn on是打开
turn off是关掉
因为是昨天,所以用过去式