Question

【题目】His mother isn't very well these days. He ________ stay at home to look after her.

A. can B. must C. could D. has to

Answer 1

【答案】D

【解析】句意“他的妈妈这几天不舒服，他不得不待在家里照看她”。A.能；B.必须（主观上）；C.能；D.不得不（客观上）。根据句意，故选D。