班超出使西域与张骞出使西域所起的不同作用是 [ ]

A．直接帮助西域各国摆脱了匈奴的控制

B．使汉朝与西域的经济文化交流频繁起来

C．使中国同西方的贸易开始发展起来

D．为以后中国的发展创造了条件

The workers will go on strike if the demands they __________ are turned down. [ ]

A. put aside  

B. put through

C. put forward  

D. put away