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4.自从1997年,一项植树计划已使内蒙古九成宫流域变成了绿色家园.
Since 1997a tree-planting programmehas changed the Jiuchengong Valleyinto a green homeland.

分析 自从1997年,一项植树计划已使内蒙古九成宫流域变成了绿色家园.

解答 答案:has changed;into
考查汉译英.change…into…意为"变为…",因句中有时间状语since1997,用现在完成时态,且主语a tree-planting programme是单数,助动词用has.

点评 注意英汉之间的差异,英语与汉语之间的一些特殊表达,准确地理解句子、翻译句子,然后根据句意及提示完成句子,使句意更通顺.

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