Tolls on roads became …… to finance what has been called a road

Question

Tolls onroads became …(49)… to finance what has been called a road revolution, involving new surfaces andbridges, new passes through the Alps, and new inns and hospices for travelers

49- 1) enough high 2) high enough 3) so high 4) too high

یک و سه که حذف میشن 

Answer 1

گزینه  2 (مفهوم میزان بالای مکفی بودن عوارض جاده ای جهت موارد مذکور در قسمت دوم جمله)