I'll have a Coca点菜时,i'll have是will还是shall或其他?

I'll have a Coca点菜时,i'll have是will还是shall或其他?
I'll have a Coca点菜时,i'll have是will还是shall或其他?

I'll have a Coca点菜时,i'll have是will还是shall或其他?
I'll have a Coca,是 I will have a Coca.

一般是Coca，please.
很少用will或shall
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