题干
Jenny tries ______ out the problem, but she finds it difficult.
A：to work
B：working
C：to working
D：didn't to work
答案(点此获取答案解析）
A
Jenny tries ______ out the problem, but she finds it difficult.
A：to work
B：working
C：to working
D：didn't to work
，则
（ ）