国家开放大学 / 综合英语（2）
正确率：100%
When I came back to the office, I found that all the lights were on. But I remember _ _ _ _ _ _ all the lights before I left.
a.to turn off
b.to turn down
c. turning off
d.turning down
a.to turn off
b.to turn down
c. turning off
d.turning down
参考答案：
佳题速递：