2. 专升本
  3. The machine can’t be made perfect overnight; in fact, it should be improved______.

The machine can’t be made perfect overnight; in fact, it should be improved______.

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问题 The machine can’t be made perfect overnight; in fact, it should be improved______.
选项 A、one after another
B、right away
C、by turn
D、step by step
答案D
解析
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