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【题目】If it _____ earlier, the printing machine would not have broken down.

A.has been repaired B.is repaired

C.had been repaired D.was repaired

【答案】C

【解析】If+主语+had done,主语+would/should have done。表示对过去虚拟。根据主句是对过去的假说,即印刷机坏了却说“应刷机就不会坏了”(“he printing machine would not have broken down”),该从句是对过去的虚拟。

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