题目

 There was a time ___a series of upsetting things happened to me every day, which depressed me a lot. A. which           B. that            C. when        D. what 答案：C18．在小数除法中，被除数和除数都缩小到原来的十分之一，商（　　）A．不变B．缩小到原来的十分之一C．扩大10倍D．缩小到原来的百分之一