Question

His essay, ____many times,was brief and to the point,and therefore won the first prize in the writing competition.?

     A.polishing up           

     B.having polished up?

     C.to be polished up

     D.having been polished up?

Answer 1

D

解析:

   having been polished up為現在分詞完成式的被動式，作定語修飾essay。根據后面的內容可知，他的文章已獲得了一等獎，而polish  up (修改，潤飾)應是在此之前，故用其完成式。句意為：他的文章，經多次修改后，簡潔而又切題，因此在作文比賽中贏得了一等獎。