56. In a plan to stop the erosion of East Coast beaches, the Army Corps of Engineers proposed building parallel to shore a breakwater of rocks that would rise six feet above the waterline and act as a buffer, so that it absorbs the energy of crashing waves and protecting the beaches.

(A) act as a buffer, so that it absorbs

(B) act like a buffer so as to absorb

(C) act as a buffer, absorbing

(D) acting as a buffer, absorbing

(E) acting like a buffer, absorb

选C？

C

1.搭配：act like: to behave orcomport oneself and descriges the action of a person

act as: describes the function of a thing

2.平行：absorbing...and protecting...

thanks a lot !!!!!