【題目】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+主語+had done，主語+would/should have done。表示對過去虛擬。根據(jù)主句是對過去的假說，即印刷機壞了卻說“應刷機就不會壞了”（“he printing machine would not have broken down”），該從句是對過去的虛擬。

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