题目内容
When talking about his unhappy experiences, he can’t help _______ a sad sigh.
A. letting out B. letting in C. letting go D. letting away
A

练习册系列答案
相关题目
题目内容
When talking about his unhappy experiences, he can’t help _______ a sad sigh.
A. letting out B. letting in C. letting go D. letting away
A