Question

They had often heard of elephants, but they had never seen one, ____being blind, how could they

They had often heard of elephants, but they had never seen one, ____being blind, how could they
?A. But
B . So
C.And
D. For。
答案是D。A选项为什么不行？

Answer 1

因为整句话不是转折关系啊，只有前后发生转折关系才能使but。
前面说的是：他们经常听说大象，但是他们从来没有看见过一只。（这句是转折关系，所以用but）
后面说的是：（因为）是盲人，（所以）他们怎么能看得见呢？（句子是因果关系，所以不能用but）
希望对你有帮助！

Answer 2

这是表原因，不是转折

Answer 3

for在这里表示原因，引导一个原因状语。