15. 밑줄 친 부분의 의미와 가장 가까운 것을 고르시오.
Although the actress experienced much turmoil in her career, she never disclosed to anyone that she was unhappy.
- ①let on
- ②let off
- ③let up
- ④let down
Although the actress experienced much turmoil in her career, she never disclosed to anyone that she was unhappy.