in spring the weather gets warmer and warmer and the trees _______ （get）green.应该填什么?

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• in spring the weather gets warmer and warmer and the trees _______ （get）green.应该填什么?为什么?谢谢
• It ___(get) warmer and warmer when spring comes.请问应该填什么 ,为什么是gets,还是will get
• in spring the weather gets warmer and warmer and the trees _______ （get）green.应该填什么?
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