题目

Don't in the room.You should keep it clean and tidy. A . make a mess B . make the bed C . make a bet D . make it 答案：A下列各式变形正确的是A.7-6+8-9=-9-6+8+7B.-12-5-9+1=1-5-9+12C.-20+2-1+4=4-2+1-20D.4-35+7+6=-35-6+4-7