应该选择:Can I have some bread?
因为面包在这里是不可数名词,和水,茶一样。如:
Can I have some water?
Can I have some tea?
any 一般用在否定句。如,
I do not have any bread at the very moment.
I do not like any bread, no matter good or bad.
I did eat any bread yesterday.
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