请问有enough as to这个用法吗？内附GWD例题。。

pennyrun

GWD-23-Q13 Researchershypothesize that granitic soil is the ideal construction material for the deserttortoise because it is not so hard that it makes burrowing difficult or sosoft that it could cause tunnels to collapse.

1. so     hard that it makes     burrowing difficult or so soft that it could cause
   

hard enough to make burrowing     difficult or soft enough as to cause
我觉得B好一些啊 是因为enough as to错的吗？

pennyrun

THX a llllllllot~

yamyam0806

enough to 是比较口语化的说法 一般不对