题目

Fred entered without knocking and, very out of breath, sank _______ a chair. A. on                           B. off                           C. into                  D. to 答案：C元朝剧作家关汉卿的代表作是（ ）A.《牡丹亭》 B.《望卢山瀑布》C.《金刚经》 D.《窦娥冤》