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Qian Xuesen could have been very rich,but he cared for no money at all.为什么这里的have不用has或had.这主语不是三单吗?

分类: 作业答案 • 2022-01-19 16:38:38

问题描述：

Qian Xuesen could have been very rich,but he cared for no money at all.为什么这里的have不用has或had.这主语不是三单吗?

答

could后面动词原形.