题目

I lived with my sister this summer and didn’t have to pay rent. So I _____ save most of my salary.   A. was able to       B. would           C. could             D. should 答案：A（2013?北京模拟）图中有九个空格，要求每个格中填如互不相同的数，使得每行、每列、每条对角线上的三格数之和都相等．问图中左上角的数是1616？