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4．He triedto climb （climb） the mountain，but he failed．

分析他努力爬這座山，但是失敗了．

解答答案：to climb．
根據(jù)空格前面的詞語是tried，因此可知這個句子考查的是try的用法，try to do sth．意思是"努力做某事"，try doing表示"嘗試做某事"．根據(jù)"but he failed"但是失敗了．因此可知他努力爬山了，但是沒有成功，所以要用不定式來填空，綜上所述，故填to climb．

點評首先要掌握句子的意思，然后結(jié)合具體的題目，就可以確定正確答案．

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