Question

— Susan, would you like to go hiking with us this afternoon?
— I'd love to, but I    study for a test.
A. may             B. have to         C. can

Answer 1

B

情態動詞的考查。May意為“可以”；can意為“能夠”，have to意為“不得不”，根據句意可知“我不得不為考試而學習”。