问题描述:
he said that he ```` to canada a few years ago a had been to b have been to c went d
老实说选a 为什么不能用went 还有 to to 不是多了一个to吗?
老实说选a 为什么不能用went 还有 to to 不是多了一个to吗?
问题解答:
我来补答展开全文阅读