一道SAT语法题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)B.ealier,but not showing any signs of disease thenC.ealier without any sign

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一道SAT语法题InGermany,forestersdiscoveredthattreeskilledbyacidrainhadbeguntodiefouryears(earlier,eventho

一道SAT语法题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)B.ealier,but not showing any signs of disease thenC.ealier without any sign
一道SAT语法题
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)
B.ealier,but not showing any signs of disease then
C.ealier without any signs of disease shown then
请问为什么第一个是最好的

一道SAT语法题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)B.ealier,but not showing any signs of disease thenC.ealier without any sign
这道题其实不用考虑的太多,楼主注意时态就ok了因为这句话大概意思就是,在德国,科学家发现四年前被酸雨淋过的树木都死了,尽管在那时那些树木并没有显示任何的征兆.所以,这道题不用考虑太多,树木显示征兆一定是发生在树木死亡之前的.所以从时态来讲,第一项选择是对的.
希望能够帮到楼主
晓篱敬上

没有为什么，就是A最通最make sense，B和C都不是地道的英文，没有人这样说话，而且意思不清楚，语法也有问题（b。but后面不是一句话； C。如果说without showing any signs of disease then, 就不错了）

这要根据这句话表达的前后意思进行选择：
3个答案差别就在
A是even though （尽管，即使）
B是but（但是）
C是without（除了）
这句话的大致意思是：在德国，林农发现那些被酸雨所害的树木早在四年前就开始（一步步）死亡了，(_？_)这些树还没有显示出生病的迹象。。...

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这要根据这句话表达的前后意思进行选择：
3个答案差别就在
A是even though （尽管，即使）
B是but（但是）
C是without（除了）
这句话的大致意思是：在德国，林农发现那些被酸雨所害的树木早在四年前就开始（一步步）死亡了，(_？_)这些树还没有显示出生病的迹象。。

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因为第一句用了一个由even though 引导的让步状语从句，使句子的意思表达得更加完善，后面两个选项在正确的情况下感觉很平实。

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