The biggest change has been the decrease in sales since the great boom years of the 1980s .我想知道这里使用的has been是时态的标志,还是有其他意思.

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/03 21:52:29
The biggest change has been the decrease in sales since the great boom years of the 1980s .我想知道这里使用的has been是时态的标志,还是有其他意思.

The biggest change has been the decrease in sales since the great boom years of the 1980s .我想知道这里使用的has been是时态的标志,还是有其他意思.
The biggest change has been the decrease in sales since the great boom years of the 1980s .我想知道这里使用的has been是时态的标志,还是有其他意思.

The biggest change has been the decrease in sales since the great boom years of the 1980s .我想知道这里使用的has been是时态的标志,还是有其他意思.
是be的现在完成时态.自从20世纪80年代里经济高度增长的年份,最大的变化是销量的减少.

应该是时态的标志,只是主语是第三人称,所以用了has

be动词的现在完成形式,仅此而已。。。

现在完成时态标志