问题
选择题
— Is this your son's sweater?
— No. ______ is on the chair behind the desk. [ ]
A. He
B. Him
C. She
D. His
答案
答案：D
搜题请搜索小程序“爱下问搜题”
— Is this your son's sweater?
— No. ______ is on the chair behind the desk. [ ]
A. He
B. Him
C. She
D. His
答案：D
如下是一个稀疏矩阵的三元组法存储表示和相关的叙述：
| 1 | 1 | 3 |
| 2 | 4 | 5 |
| 3 | 3 | 2 |
| 4 | 2 | 6 |
| 5 | 3 | 3 |
A．只有①
B．①和②
C．只有③
D．①、②和③