Question

【题目】—Why didn't you come to my party?

—I _____stay at home，because my mother was ill.

A. has to B. have to C. had D. had to

Answer 1

【答案】D

【解析】句意：--为什么你没有来参加我的聚会？--我不得不呆在家里，因为我的妈妈生病了。根据was ill可知，生病发生在过去，所以不得不呆在家里也发生在过去，所以用had to不得不。后加动词原形。故选D。