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）
They had often heard of elephants,but they had never seen on
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