sat OG语法一题In Germany,foresters discovered that trees killed

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sat OG语法一题
In Germany,foresters discovered that trees killed by acid rain had begun to die four years earlier,even though the trees had shown no signs of disease then.
A
B earlier,but not showing any signs of disease then
C earlier,no outward signs of disease had been shown then in the trees,however
D earlier without any signs of disease shown then
E earlier,not then having shown any signs of disease,however
为啥选A不选D啊

答案的确是A.even though表示转折意思“尽管”,逻辑上正确；再者,时态用的是had shown也没问题.
D不正确,虽然without这个结构用的很好,但是without是介词,后面要跟上名词或动名词(V-ing),但D选项后面用的是shown过去分词,不对.至少要改成without any signs of disease being shown then才语法正确,但这样又不符合SAT的简洁性原则,所以不能选.

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