问题
选择题
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
答案：C
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。
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