Question

【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

Answer 1

【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。