The machine can’t be perfected overnight; in fact, it should be improved ______

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问题 The machine can’t be perfected overnight; in fact, it should be improved ______ .

选项 A、one after another
B、by turn
C、fight away
D、step by step

答案 D

解析短语辨析。根据句子的逻辑关系，此处应用overnight(一夜之间)的反义词。one after another意为“接二连三，一个接一个”；by turn意为“轮流”；right away意为“立刻，马上”；step by step意为“循序渐进”。因此选D。

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