题目

The Beatles,________ many of you are old enough to remember，came from Liverpool. A. forB. though    C. AsD. since   答案：Cas引导的非限制性定语从句，as代替整个主句。   下列国家属于中亚的是 [　　] A．阿富汗 B．蒙古 C．阿塞拜疆 D．土库曼斯坦