[讨论]问一道语法题，白勇书上的。

   
                            According to the National Pasta Association, per-capita consumption of pasta in the United States, which has already been approaching 19 pounds a year, will achieve 30 pounds a year by the twenty-first century.

(A) According to the National Pasta Association, per-capita consumption of pasta in the United States, which has already been approaching 19 pounds a year, will achieve 30 pounds a year by the twenty-first century.

(B) Already approaching 19 pounds a year in the United States, the National Pasta Association predicts that per-capita consumption of pasta will reach 30 pounds a year by the twenty-first century.

(C) The National Pasta association predicts by the twenty-first century that per-capita consumption of pasta in the United States, which is already approaching 19 pounds a year, will reach 30 pounds a year.

(D) By the twenty-first century, the National Pasta Association predicts that per-capita consumption of pasta in the United States, having already approached 19 pounds a year, will reach 30 pounds a year.

(E) According to the National Pasta Association, per-capita consumption of pasta in the United States is already approaching 19 pounds a year and will reach 30 pounds a year by the twenty-first century.

为什么答案是E呢，E项不是改变了原文的意思么？A怎么错了？which应该可以指代前面的中心词per-capita consumption的呀。

E並無改變原意，原句的意思是：

一個機構(NPA)預測，在21世紀之前，美國每人消費pasta量將由現在的19上升至30

A不應該用現在進行式，因為並無明顯時間暗示要用進行式.

B主詞搭配錯誤

C時間副詞應放到that後面

D改變句意，因為移動了時間副詞到句首。