新概念4第十二课的第一句话到底改怎么解读？
When anyone opens a current account at a bank, he is lending the bank money, repayment of which he may demand at any time, either in cash or by drawing a cheque in favour of another person.
尤其是那个repayment of which，就是没读懂那个repayment of which

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He may demand repayment of the money (that he lent the bank when he opened a currrent account) at any time.

repayment of which……这句是定语从句，which指的money (lent by someone).
你如果不用定语，单独变成句子就是：
He may demand repayment of the money at any time,either…

我给你翻译一下，你自己看着领会。任何人在银行开立一个活期账户，就是把钱借给了银行。这笔借款他可以随时要求归还，要么以现金形式，要么通过开具一张以他人为受益人的支票。