When he knew that he had passed the driving test, he smiled . A. in dangerB. in reliefC. i

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A. in danger
(答案→)B. in relief
C. in peace
D. in return
解析：句意：当他知道自己通过了驾照考试，他如释重负的笑了。in danger处于危险中； in relief 如释重负 ；in peace安静地 ；in return作为报答 ，选B。