Question

—How about singing songs with me?
—I’m sorry I can’t. I           help my father with his work.
A. have to                    B. can                     C. may

Answer 1

A

本题的含义是我不能和你唱歌，那么后面帮助父亲干活是必须做的，是客观的要求，表示必须，不得不选项中只有have to，故选A。