pp-1-140

140. It is said that no potential frontier has such fired

    the imagination or challenged the ingenuity of

    humankind as has space.

答案為b了解,不過請問一下,d選項是不是改為  as does space比較好呢

First thing I need to clarify is that “as has space” here is a reversed structure. And then our question will focus on why it wasn‘t “as does space have”. As we all know, have/has is a special verb which can be used as either predicate verb or auxiliary verb. In the case of the above sentence, although "has" work as the predicate of "space", it still carries the auxiliary verb's character, that is, moving to the place preceding to the subjective in a reversed structure.