Dina, ______ for months to find a job as a waitress, finally took a position at a local advertising agency.
 
【正确答案】 C
【答案解析】 struggle和句子主语Dina在逻辑上构成主谓关系,且发生在谓语动词take之前,因此用现在分词的完成式结构,在句子中作状语。