问题描述：
can you come to my party this weekend?
I'm afraid I can't .I ___ to Shanghai on business.
a.am going b.should go
为什么不可以选B？
I'm afraid I can't .I ___ to Shanghai on business.
a.am going b.should go
为什么不可以选B？
问题解答：
我来补答展开全文阅读