题目

（2011·四川成都市摸底）       in diving stilts, they walked into a magic world lighted by learns on board.        A．Dressing             B．Wearing               C．Worn                  D．Dressed 答案：D考查过去分词的用法。此处be dressed in意为：穿着。By the time Einstein was 14 years old, he ________ himself advanced mathematics.  A. has taught      B. taught  C. had taught      D. was teaching