题目

计算42+8= 52-6= 37+6=26+7=18-8=19-5= 4+14= 15-6=20-5= 2+16= 60＋（ ）＝75 （ ）＝19＋20 答案：42+8=50 52-6=46 37+6=4326+7=33 18-8=1019-5=14 4+14=18 15-6=9 20-5=15 2+16=18 60＋15＝75 39＝19＋20—You should do some housework ________________ you have grown up. —OK, dad, I will.A. unless B. untilC. since D. although