It was not _____ she took off her glasses _____ I realized she was a famous film star.　　

A．when , that 　

B．until , that

C．until , that

D．when , then

在下述MPP系统的特点中，不正确的是______。

A．P2P通信模式

B．分布式网络

C．简单的客户端

D．XML的数据格式