I to Las Vegas before you back next week.I to Las Vegas before you back next week.A.am going; come B.shall go; come为什么选B不选A?

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I ____to Las Vegas before you ____ back next week.I ____to Las Vegas before you ____ back next week.A.am going; come B.shall go; come为什么选B不选A?
I ____to Las Vegas before you ____ back next week.
I ____to Las Vegas before you ____ back next week.
A.am going; come
B.shall go; come
为什么选B不选A?

I ____to Las Vegas before you ____ back next week.I ____to Las Vegas before you ____ back next week.A.am going; come B.shall go; come为什么选B不选A?
一般将来时,shall do有应该的意思

be going to 表示一种个人打算，而这里是指事情将要发生

一般来说be doing表示正在做的事情，表示未来的动作的时候，是即将发生的，而且shall还表示有意愿去做某事

此句为将来时，going后应有to go

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