He didn't want to tell me how much the bag____. A cost B costed (说一下原因,谢谢)

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He didn't want to tell me how much the bag____. A cost B costed (说一下原因,谢谢)
He didn't want to tell me how much the bag____. A cost B costed (说一下原因,谢谢)

He didn't want to tell me how much the bag____. A cost B costed (说一下原因,谢谢)
答案:A
cost的过去式就是cost本身.