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20．Everythingthathe did seemed reasonable．

分析他做的一切都似乎是合理的．

解答 that 考查定語從句．先行詞是everything，在定語從句he did中做did的賓語，又因為先行詞是不定代詞everything，所以答案填關系代詞that．

點評定語從句又稱為形容詞性從句，綜觀歷年高考試題，我們可以發現該語法項目是測試中的熱點與難點，解定語從句的題目首先要知道哪一句是主句，哪一句是從句，被修飾的詞是誰，從句中的句子成分缺失什么，根據缺失成分的不同從而選出相對應的關系代詞或者關系副詞，從而選出正確的答案，解題的關鍵是從句句子的成分分析．

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