题目内容
4.There ____great changes in such kind of PDAs (掌上电脑)in the last few years.( )A. | has been | B. | have been | C. | has had | D. | have had |
分析 翻译:这种掌上电脑在过去的几年里有非常大的变化.
解答 答案:B
根据in the last few year.在过去的几年里,即:从现在算起之前的几年.last 之前的,过去的.这个时间状语与现在完成时态连用;又因There be在现在完成时结构中,great changs是复数所以助动词要用have,系动词be的现在完成时形式是been.故选:B
点评 本题考查现在完成时.have been是动词be的现在完成时行式,当主语为第三人称单数时,使用has been的形式.和不同的单词连用,表达不同的意思.
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