“There has been great changes in computers in the last few year”

“There has been great changes in computers in the last few year”

题目
“There has been great changes in computers in the last few year”
为什么是 has been不是have had
答案
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...
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