答案：B

题目分析：考查从句，从句he will be back from abroad.不缺少成份，先行词是tomorrow morning，所以是B，句子意思“明天上午我将去机场接我的叔叔，那个时候他将从国外回来”

点评：做从句题时，首先看从句是否缺少成份，如果缺少就在关系代词里找引导词；如果不缺少成份，就在关系副词里选择引导词

即学即练：That is the small house less than 20 square meters, under ______Roof lives a large family of three generations.

A. which        B. whose      C. its     D. that

选B