◎ 题干
____ 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
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“____ we admit that there are still some problems about NMET, we don't mean that it is of no use. [ ]A. UntilB. While C. As D. Unless …”主要考查了你对  【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。