来自0000007高高的问题
英语句子的时态问题
1,The last half of the nineteenth century witnessed the steady improvement in the means of travel The last half of the nineteenth century为“19世纪的后半段”,是一段时间。那么为什么不是用has witnessed? 2,He fought the wolves off for three hours before help arrived.为什么谓语不是had fought?
0回答
2016-05-24 01:57