问题
选择题
If penicillin _____________ available, many people ______________ from sickness.
A．weren’t , would have died
B．shouldn’t be, would die
C．hadn’t been, would have died
D．is, will die
答案
答案：C
题目分析：考察虚拟语气。本题考察的条件句的虚拟语气。当和过去事实相反的似乎，条件状语从句中使用过去完成时，主句中使用“情态动词+have done”。句意：如果没有盘尼西林，很多人都会死于疾病。故C正确。
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