请问885的section18-18

18.     Even though the state has spent ten years and seven million dollars planning a reservoir along the laceName>UbilaceName> laceType>RiverlaceType>, the project will have to be abandoned as a result of the river becoming so heavily polluted.

(A) will have to be abandoned as a result of the river becoming so heavily polluted

(B) is to be abandoned on account of the heavy pollution which the river received

(C) had to be abandoned because the river had received such heavy pollution

(D) has to be abandoned because of the river and its heavy pollution

(E) must be abandoned because the river has become so heavily polluted

答案是e, b为什么不对？用be to将来时态对不对？

1. is to be abandoned表达怪异, 没有原文所要表达的" 必须 "的情态; 再说这样的表达被动语态很怪异

2. on account of the heavy pollution which the river received: 表达累赘

谢谢rhod和狗狗的解答