________ the morning train, he would not have been late for the meeting.A．Did h

题型：不详难度：来源：

________ the morning train, he would not have been late for the meeting.

A．Did he catch

B．should be catch

C．has he caught

D．Had he caught

答案

D

解析

试题分析：句意：如果他赶上了早班火车，开会就不会迟到了。主句的谓语动词是would not have been ，说明与过去事实相反，从句则可以用if he had caught the morning train, 当if从句中有were、had或者should 时，在可以省略if，把were、had或者should放在句首构成倒装句形式。本句中含有had，所以不用if时，就变成了 Had he caught the morning train。所以选D。