15．Several problems havearisen（出現(xiàn)）  since the plan got carried out．

分析 自從計劃實施以來，已經(jīng)出現(xiàn)了幾個問題．

解答 答案是arisen．考查翻譯填空．題干缺少謂語，用動詞arise表示"出現(xiàn)"．助動詞have后面接動詞的過去分詞形式，所以用arise的過去分詞arisen．故答案是arisen．

點評 解答此類問題，首先需要明確需要填寫的單詞詞性，然后根據(jù)題干要求和相關(guān)語法填寫正確的答案．

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