up to 是固定用法
意为“不超过……”
等于no more than
and 并列连词一般其前不加逗号,在此只是为了区分句子的意思,相当分层,说完一件事再说另一件,逗号可以去掉.
at most 是指“最多……”这样的用法还有at least 至少
for+时间段说法是对的,
加at most 并不影响这个用法.
you may borrow up to five books at a time,and keep them for
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