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19．She tried her best to solve the problem，but it wasuseless （use）．

分析她盡最大努力解決這個問題，但是沒有用．

解答答案：
根據上文She tried her best to solve the problem可知她盡最大努力解決這個問題，結合連詞but，可知下文表達轉折的意思，結合所給詞use"用途"故推知但是沒有用，故填入形容詞useless"沒用的"在句中作表語，故答案為：useless

點評本題考查用所給單詞的適當形式填空，首先要根據語境明確句意，然后再根據相關語法對所給單詞在形式上做出正確的變化．

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