题目内容

—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’tB．mustn’tC．can’tD．needn’t
C
Could在句中表委婉的请求，否定回答是要用can’t。而不是couldn’t。所以选C。
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