HE TURNED OFF THE LIGHTS BEFORE GOING OUT _____ WASTE ELECTRICITY....

23. - BAI TAP TIENG ANH 12 HAY CO DAP AN
BAI TAP TIENG ANH 12 HAY CO DAP AN
23. He turned off the lights before going out _____ waste electricity.A. so that not B. as not to C. in order that not D. so as not to