问题描述：
——Are you still going to Shanghai for the Spring Festival?——yes,but I really _because I have a
lot of things to deal with.A.can't B.mustn't C.won't Dshouldn't
为何选D
lot of things to deal with.A.can't B.mustn't C.won't Dshouldn't
为何选D
问题解答：
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