1. The existence of oil wells“ has” been known for a long time. 为什么用has 而不用have

分类: 作业答案 • 2022-01-18 16:27:45

问题描述：

1. The existence of oil wells“ has” been known for a long time. 为什么用has 而不用have
请问为什么用has 而不用have

答

The existence of oil wells“油井的存在”是一个整体,做主语,且“存在一词不可数.”