求助大全840

840 The United States petroleum industry’s cost to meet environmental regulations is projected at ten percent of the price per barrel of refined petroleum by the end of the decade.

(A) The United States petroleum industry’s cost to meet environmental regulations is projected at ten percent of the price per barrel of refined petroleum by the end of the decade.

(B) The United States petroleum industry’s cost by the end of the decade to meet environmental regulations is estimated at ten percent of the price per barrel of refined petroleum.

(C) By the end of the decade, the United States petroleum industry’s cost of meeting environmental regulations is projected at ten percent of the price per barrel of refined petroleum.

(D) To meet environmental regulations, the cost to the United States petroleum industry is estimated at ten percent of the price per barrel of refined petroleum by the end of the decade.

(E) It is estimated that by the end of the decade the cost to the United States petroleum industry of meeting environmental regulations will be ten percent of the price per barrel of refined petroleum. 

答案是E,我选的D.

请问E和D的区别在哪里，不太明白啊，

先谢过各位了！！！！

D的意思是，the cost is estimated to meet environment regulations

E的意思是，the cost of meeting environmental regulations

看出差别不？

OG11版第21题说:estimated后面必须是不定式to be,介词at不可以

estimated后面要么to be,要么that clause

谢谢楼上了，我现在明白了

补充estimate的用法

1. estimate + Noun + to be + Noun/Adj.

2. estimate + Noun + at + Noun

3. estimate + that