题目

33. The father asked the boy again, raising his voice a bit, but still ________ no reply. A. receiving       B. received         C. had received       D. to receive 答案：B某工厂今年产值为a，计划今后每年平均增长m％，那么2年后的产值是 [　　] A．2a(1＋m％)B．C．a＋2m％D．a＋2a(1＋m％)