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8．Shehas spent （spend） so much time looking after her children that she has to give up her job as a teacher．

分析她花費(fèi)了那么多的時(shí)間照顧孩子們，以致于她不得不放棄了老師的工作．

解答答案：has spent．現(xiàn)在完成時(shí)的構(gòu)成：have/has+過(guò)去分詞，表示動(dòng)作發(fā)生在過(guò)去，強(qiáng)調(diào)對(duì)現(xiàn)在造成的影響．根據(jù)"she has to give up her job as a teacher．"以及"（spend） so much time looking after her children"可知花費(fèi)了那么多的時(shí)間照顧孩子對(duì)她造成了很大的影響，導(dǎo)致辭職，所以要用現(xiàn)在完成時(shí)來(lái)強(qiáng)調(diào)對(duì)現(xiàn)在造成的影響，結(jié)合給出的英語(yǔ)提示"spend"，又因?yàn)橹髡Z(yǔ)是she，所以要用has spent．

點(diǎn)評(píng) 首先要掌握現(xiàn)在完成時(shí)的用法以及構(gòu)成，然后結(jié)合具體的語(yǔ)句，以及給出的英語(yǔ)提示，就可以確定正確答案．

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