17．To learn（learn） more about Africa culture，we decided to travel there for a long time．

分析 為了了解更多關(guān)于非洲的文化，我們決定在那里旅行很長一段時(shí)間．

解答 答案：To learn
根據(jù)后句we decided to travel there for a long time我們決定在那里旅行很長一段時(shí)間，推出前句應(yīng)是指這樣做的目的所在；結(jié)合提示詞learn為動(dòng)詞，所以此處應(yīng)用其動(dòng)詞不定式to learn作目的狀語，意為：為了了解更多關(guān)于非洲的文化，符合句意及用法．故填：To learn

點(diǎn)評(píng) 本題考查用所給單詞的適當(dāng)形式填空，首先要根據(jù)語境明確句意，然后再根據(jù)相關(guān)語法對(duì)所給單詞在形式上做出正確的變化．

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