Question

Simon is very regretful. If he had been more careful, he _____ such a big mistake.

A．hasn’t made	B．hadn’t made
C．won’t have made	D．wouldn’t have made

Answer 1

D

试题分析：句意:西蒙是很后悔的，如果他再仔细点，他就不会犯这么大的一个错误。这里是虚拟语气，根据had been可以看出是对过去的虚拟，故主句用would have done的形式，根据句意故选D。
点评：本题难度适中。虚拟语气是近几年高考的热点，虚拟语气的情况复杂，形式多样，需要考生牢记它们的不同的用法，再根据不同的语境分析句子应该用哪种情况的虚拟。这里是从句和主句都是对过去的虚拟。
即学即练：Tell John not to leave the house unless he _____that the lights ______ .
A. will make sure, turn off     B. makes sure; are turned off
C. will make sure; will turn off    D. makes sure; will be turned off
解析：B。第一空在条件状语从句中用一般现在时代替一般将来时；第二空所有的灯被关掉。