Mrs.White has promised that she____ her son a bicycle.

题目

Mrs.White has promised that she____ her son a bicycle.
应该填 will buy
为什么啊.

答案

has promised 现在完成时属于现在时,后面的宾语从句可以用任意时态.
根据句意,怀特夫人已经许诺要给她的儿子买一辆自行车.“ 买自行车”将来时