I am going to the airport to meet my uncle tomorrow morning, he will be back from abroad.
A. who
B. when
C. where
D. which
网友回答
A. who
(答案→)B. when
C. where
D. which
解析：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”