问0401的一道阅读题

kinki_yyUID: 2131963

23)According to the passage,New Elamite is
A)a language that was written in the cuneiform script
D)a language that was understood by the late eighteenth century
  
原文定位:Then inscriptions found in baa at the end of the eighteenth century provided a link:these inscriptions
were written in cuneiform and in two other ancient languages,Old Persian and New Elamite---languages that had
already been deciphered.

我选的是A,答案是D,我是这么理解的:OP和NE这两个语言都是在inscriptions上发现的,并且破折号以后也说拉是"had already been "也就是已经被破解拉。为什么选D呢？
0401的题争议好大哦，搜了一下，这道题似乎没人问我就提出来了，帮我看看吧

hypocricyUID: 2165571

是在late eighteenth century时had already been deciphered的
关键点有两处：
1，“Then”
2，“It is took several decades,....”