—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
A
本題的含義是我不能和你唱歌，那么后面幫助父親干活是必須做的，是客觀的要求，表示必須，不得不選項中只有have to，故選A。
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