【题目】Johnson, _________ for months to find a job, finally took a position at a local advertising agency.
A. to struggle B. struggling
C. struggled D. having struggled
在线课程【答案】D
【解析】
试题分析：句意：Johnson努力了几个月找工作，最后在当地的一家广告代理处谋了个职位。句中谓语动词是took和struggle的主语都是Johnson，此处做状语用动词-ing形式；且两个动词有动作先后，struggle发生较早要用完成形式，故选D.