问题
选择题
My sister wants a new dress. She ________ it to the party, [ ]
A. wears
B. has worn
C. wore
D. is going to wear
答案
答案：D
搜题请搜索小程序“爱下问搜题”
My sister wants a new dress. She ________ it to the party, [ ]
A. wears
B. has worn
C. wore
D. is going to wear
答案：D
有三个关系R、S和T如下：
| R | ||
| A | B | C |
| a | 1 | 2 |
| b | 2 | 1 |
| c | 3 | 1 |
| S | ||
| A | B | C |
| a | 1 | 2 |
| b | 2 | 1 |
| T | ||
| A | B | C |
| c | 3 | 1 |
A．自然连接
B．差
C．交
D．并