The room was dark I turned on the lights.A. andB. orC. butD. so

问题补充：

The room was dark, I turned on the lights.

A. and

B. or

C. but

D. so

答案：

A. and

B. or

C. but

(答案→)D. so

解析：考查连接词。and“和，而且”表并列；or“或者，否则”表选择和转折；but“但是”表转折；so“因此”表因果。句意“房间里很黑，所以，我把灯打开了。”故选D。