Question

If it ____for the snow, we____ the mountain yesterday.

A．were not, could have climbed	B．were not, could climb
C．had not been, could have climbed	D．hadn’t been, could climb

Answer 1

C

解析试题分析：考查条件句的虚拟语气：句意：要不是因为昨天的雪，我们就会爬到山上了。可知这是和过去相反的if虚拟条件句，if从句用If主语+had+done；主句：主语+should/would/could/might+have done，选C。
考点：考查条件句的虚拟语气
点评：if的虚拟语气非常重要，简要概括如下：1、表示与现在事实相反的情况，从句：If主语+过去时(Be动词用were)；主句：主语+should/would/could/might+do：　2、表示与过去事实相反的情况，从句：If主语+had+done；主句：主语+should/would/could/might+have done　3、表示对将来情况的主观推测，从句：①if+主语+were to do②if+主语+should+do ③if+主语+did（动词过去式）/were ；主句：主语+should/would/could/might+do