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