4. 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
答案如何是C呢?as 应该接句子阿,怎么能接一个词组呢/
那如何分辨as是介词还是连词呢?尤其是在有As还有like的句子中
与rise平行决定必须用act,与protecting平行决定必须用absorbing,故选C
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