4.There ____great changes in such kind of PDAs (掌上電腦)in the last few years.( 。
A.has beenB.have beenC.has hadD.have had

分析 翻譯:這種掌上電腦在過(guò)去的幾年里有非常大的變化.

解答 答案:B
根據(jù)in the last few year.在過(guò)去的幾年里,即:從現(xiàn)在算起之前的幾年.last 之前的,過(guò)去的.這個(gè)時(shí)間狀語(yǔ)與現(xiàn)在完成時(shí)態(tài)連用;又因There be在現(xiàn)在完成時(shí)結(jié)構(gòu)中,great changs是復(fù)數(shù)所以助動(dòng)詞要用have,系動(dòng)詞be的現(xiàn)在完成時(shí)形式是been.故選:B

點(diǎn)評(píng) 本題考查現(xiàn)在完成時(shí).have been是動(dòng)詞be的現(xiàn)在完成時(shí)行式,當(dāng)主語(yǔ)為第三人稱單數(shù)時(shí),使用has been的形式.和不同的單詞連用,表達(dá)不同的意思.

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