would you come to my birthday party tomorrow evening?i'm afraid i——.i have to look after sisterA.wouldn'tB.can'tC.won'tD.mustn't

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would you come to my birthday party tomorrow evening?i'm afraid i——.i have to look after sister
A.wouldn't
B.can't
C.won't
D.mustn't

C.won't
我认为,would在问句中不是过去式,是请求语气
所以是won't