Question

He ________ carefully, but he didn't ________ anything．

A. listened; heard B. listened; hear C. heard; listen D. listen; hear

Answer 1

答案嫌漏握B
listen强搜烂调听的动作；hear强调听的结果。didn't为助动词，其后用动词原形，另外but连接两个一般过去时的句子。芹庆故选B。