题干
If you stick hard at sth. you must be successful.
A：to work
B：to be worked
C：to working
D：to be a worker
答案(点此获取答案解析）
C
If you stick hard at sth. you must be successful.
A：to work
B：to be worked
C：to working
D：to be a worker
表示的图形是（ ）
