请教一道填空题They ______(appoint)three new teachers this year.答案是h

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请教一道填空题
They ______(appoint)three new teachers this year.
答案是have appointed
为什么填了现在完成时呢?
为什么不用一般过去时呢？？

一般过去时表示某一瞬间发生的动作,而这题中意思是今年为止,不是一瞬间的动作,而是有一个持续过程,所以用现在完成时,如果把this year去掉,那么既可以用一般过去时也可以用现在完成时,只是前者意思是他们换了3个老师,没有具体时间概念,而后者意思是他们到目前为止已经换了3个老师,有一个时间概念

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