改进题：His parents were on tenterhooks all the time until they got

改进题：His parents were on tenterhooks all the time until they got his letter.

译文：他一直心烦意乱在父母在收到他的信之前。
【正确答案】：改进的译文：他的父母在收到他的信之前一直心烦意乱。
【题目解析】：p120