题目内容

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

[  ]

A.

listened; heard

B.

listened; hear

C.

heard; listen

D.

listen; hear

答案:B
解析:

listen强调听的动作;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。故选B。


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