【题目】I kept ______ the incident, asking myself again and again how it could have happened.
A. chewing on B. sticking to
C. referring to D. relying on
在线课程【答案】A
【解析】
考查动词词组。句意：我不停地细想着这件事，一次又一次地问我自己是怎么发生的。A. chewing on细想；B. sticking to坚持；C. referring to提及；D. relying on依赖。故选A。