请教NN 大全－10

1.        A large rise in the number of housing starts in the coming year should boost new construction dollars by several billion dollars, making the construction industry’s economic health much more robust than five years ago.

(A) making the construction industry’s economic health much more robust than five years ago

(B) and make the construction industry’s economic health much more robust than five years ago

(C) making the construction industry’s economic health much more robust than it was five years ago

(D) to make the construction industry’s economic health much more robust than five years ago（C）

(E) in making the construction industry’s economic health much more robust than it as five years ago

making...,是作为同位语吗？为什么不选B呢？

C is right

为什么不选D to do