would you come to my birthday party tomorrow evening?i'm afraid i——.i have to look after sister

问题描述:

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答案是B