一道SAT语法题

一道SAT语法题

原句不改动是 run-on sentence 错误。
加上but 后也无主、从句之分。加上 but 后则是由连词 but 连接的并列句。
问题中的 until 是副词，不是从属连词，故全句无主、从句之说。
until 的词性有：
 
A. 副词
Until recently, sponges were believed to be modern descendants of the first animals.
Until recently I thought an armadillo was a pangolin, but now I know they are not quite the same.
 
B. 介词
Bring the liquid to a boil, then reduce heat until simmering.
Stay put until dusk.
But the others did not borrow in size until that fall.
 
C. 从属连词
Review of applications will begin immediately and continue until position is filled.
The wallpaper image will remain until the computer is restarted.
Steel cables stretched over the giant pylons provided support until the arch was completed.
Seeds cannot germinate until certain favorable environmental conditions are met.
They are only biding their time until political conditions allow them to once again cut taxes.  
There they'll grow and bloom through winter until their crescendo in spring.

此处Until做副词，整句缺少连词。而且从句意来看少转折关系

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