[求助]大全Section C-21 and 24

21.   At the time of the Mexican agrarian revolution, the most radical faction, that of Zapata and his followers, proposed a return to communal ownership of land, to what had been a pre-Columbian form of ownership respected by the Spaniards.

(A) land, to what had been a pre-Columbian form of ownership respected by the Spaniards

(B) land, a form of ownership of the pre-Columbians and respected by the Spaniards

(C) land, respected by the Spaniards and a pre-Columbian form of ownership

(D) land in which a pre-Columbian form of ownership was respected by the Spaniards（A）

(E) land that had been a pre-Columbian form of ownership respected by the Spaniards

我选了E。现在觉得E确实不对，但没见过to what的用法，请NN们指教

24.   In his eagerness to find a city worthy of Priam, the German archaeologist Schliemann cut through Troy and uncovered a civilization a thousand years older as was the city Homer’s heroes knew.

(A) older as was the city Homer’s heroes knew

(B) more ancient than the city known to Homer’s heroes

(C) older than was the city known to Homer’s heroes

(D) more ancient of a city than Homer’s heroes knew（B）

(E) older of a city than was the one known to Homer’s heroes

为什么C不对？

谢谢！