Although it was not named ________ 1782, this kind of metal was used as early as

题型：不详难度：来源：

Although it was not named ________ 1782, this kind of metal was used as early as 5300 BC．
A．in                   B．for            C．until          D．since

答案

C

解析

考查not … until …直到……才……。句意：尽管它直到1782年才有名字，这种金属早在公元前5300就被使用了。