Question

_________ 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

Answer 1

B

连词while的意思是“当.……的时候, 虽然”，如：While he loves his students, he is very strict with them. 虽然他爱他的学生, 可是他对他们很严格。