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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．

分析她花費了那么多的時間照顧孩子們，以致于她不得不放棄了老師的工作．

解答答案：has spent．現在完成時的構成：have/has+過去分詞，表示動作發生在過去，強調對現在造成的影響．根據"she has to give up her job as a teacher．"以及"（spend） so much time looking after her children"可知花費了那么多的時間照顧孩子對她造成了很大的影響，導致辭職，所以要用現在完成時來強調對現在造成的影響，結合給出的英語提示"spend"，又因為主語是she，所以要用has spent．

點評首先要掌握現在完成時的用法以及構成，然后結合具體的語句，以及給出的英語提示，就可以確定正確答案．

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