题目

 “You ______ your teacher for help. He is kind-hearted.” “Yes. A whole day _______.”     A. can ask, will waste     B. must have asked, had wasted     C. could have asked, was wasted     D. shouldn’t have asked, would be wasted 答案：C计算（能简算的一定要简算）（1）〔20-（57×1.75+134×27）〕÷12（2）1+32+522+723+924+1125+1326．