Mack is talking to his friend Don
Hi,Don!How are you doing in your English class?
Not so well,I'm afraid.
What's the problem?
I'm not improving,Tell me,how come your English is so good?
Well,uh... I have an American girlfriend.
Aha! That's it,Now I know what to do.(He runs off.)
Hey,come back! I was just kidding.
How come + 主语 + 动词 ... ? 为什么...?（不需要倒装）
= Why + 倒装句
How come you didin't show up at the party?
= Why didn't you show up at the part?
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