He didn’t listen to the teacher carefully he couldn’t answer the questions.A. for exam

问题补充：

He didn’t listen to the teacher carefully, , he couldn’t answer the questions.

A. for example

B. even though

C. as a result

D. as usual

答案：

A. for example

B. even though

(答案→)C. as a result

D. as usual

解析：句意：他没有仔细听老师讲课，结果，他不能回答问题。. for example例如；even though即使；as a result结果；as usual像往常一样。所以选C。