问题
选择题
| ____ we admit that there are still some problems about NMET, we don't mean that it is of no use. |
A. Until B. While C. As D. Unless |
答案
答案：B
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| ____ we admit that there are still some problems about NMET, we don't mean that it is of no use. |
A. Until B. While C. As D. Unless |
答案：B