as big a house as与the same big house as比较

北京高考考试题：

Our neighbor has _______ ours.

A. as a big house as

B. as big a house as

C. the same big house as

D. a house the same big as

答案是B。我感觉C也正确。same也有similar的意思。这道题不严谨。我的理解对吗？

当the same不是指“同一个”的时候，意为exactly like another person/thing. 因此就没必要再在其后加其它形容词，由于as后面的名词表示的是已知信息，仅需说明二者相同即可。因此，the same big house as ours是不对的，违背了语言逻辑。