I was trying hard ________ , but my mind kept ________．A.to concentrate…to wanderB.concentrating…wanderingC.to eoncentrate…wanderingD.concentrating…to wander
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C解析动词try的用法是try to do sth意思是“努力，一定要做某事”。比较：try doing sth尝试做某事(是否做成并不一定重要)keep doing sth一直在做某事