—Could you please come to the museum with me this afternoon?
—Sorry, I ______. I have to take a piano lesson at 2 pm. [ ]
A. couldn't
B. mustn't
C. can't
D. needn't
答案:C
—Could you please come to the museum with me this afternoon?
—Sorry, I ______. I have to take a piano lesson at 2 pm. [ ]
A. couldn't
B. mustn't
C. can't
D. needn't
答案:C