3. 选该题考察非真实条件的虚拟。在表示过去情况的虚拟条件句中,条件从句用了过去完成时形式,主句可用should+have+过去分词的形式
4. 选该题考察含蓄条件的虚拟。But for含义为要不是,用于此处可以表达假设条件,but for his timely arrival=If it had not been for his timely arrival或If he had not arrived on time.
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