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--that car must have cost a lot of money.

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--that car must have cost a lot of money.
--on,no._________
请问否定回答用 it didn't 还是用 it can't.
不过记得是这样的 must have v-ed 否定形式为:can’t / couldn’t have v-ed,为什么又用it didn't 还是与can't/couldn't have 都可以?不太明白这点,请再指教
应该是 it didn't
强调买那个时候没有花很多钱