He studied hard the exam.A. aim atB. aiming at passingC. aiming passingD. aiming to pass

问题补充：

He studied hard, the exam.

A. aim at

B. aiming at passing

C. aiming passing

D. aiming to passing

答案：

A. aim at

(答案→)B. aiming at passing

C. aiming passing

D. aiming to passing

解析：考查非谓语动词，分词做状语，介词后跟动名词，所以选B，句子意思“他学习很刻苦，目的是通过考试”