“There has been great changes in computers in the last few year”
问题描述:
“There has been great changes in computers in the last few year”
为什么是 has been不是have had
答
是There be 结构的现在完成时.一般时态情况下是:There is great changes in computers.在计算机领域有很大变化.而加上了in the last few years,表示在过去的几年里已经发生了很大变化,需要用现在完成时,所以变成了there has been...