题干
—Yao Yuan, a disabled woman, won the National Championships Cup last week.
—My goodness! She _______a lot of difficulties!
—My goodness! She _______a lot of difficulties!
A：may go through
B：might go through
C：must have gone through
D：ought to have gone through
答案(点此获取答案解析）
C
所表示的曲线是（ ）