1．They might have found a better hotel if they a few more kilometers.(2018·北京，13)

A．drove B．would drive

C．were to drive D．had driven

答案　D

解析　根据主句的谓语形式以及语境可知，if条件句应该用过去完成时，表示与过去事实相反的虚拟语气。与过去事实相反的虚拟语气的结构：主句谓语用"should/would/could/might＋have done"，从句谓语用"had＋过去分词"。

2．If we the flight yesterday，we would be enjoying our holiday on the beach now.(2018·天津，15)

A．had caught B．caught

C．have caught D．would catch

答案　A

解析　句意为：如果我们昨天赶上了航班的话，我们现在就在海滩上享受假期了。根据前半句中的时间状语yesterday以及后半部分中的would be enjoying及时间状语now可知，这是一个错综时间条件句。从句表示与过去的事实相反的假设，故用"had＋动词的过去分词"。

3． not for the support of the teachers，the student could not overcome her difficulty.(2017·江苏，22)

A．It were B．Were it

C．It was D．Was it

答案　B

解析　句意为：如果没有老师们的支持，这名学生不可能战胜困难。此处表示与现在事实相反的假设，从句谓语用were；在非真实条件句中，如果有should，had或were时，可以省