虚拟语气While crossing the mountain area, all the men carried gu

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虚拟语气
While crossing the mountain area, all the men carried guns lest they _______ by wild animals.
A. should be attacked B. had been attacked
C. must be attacked D. would be attacked
答案选A,为什么?为什么不选B?

因为lest后面要接虚拟语气,虽然B中的过去完成式也是虚拟语气的常用表达方式,但过去完成式只能用来虚拟过去的情况,也就是表达过去未完成的打算,过去要做却没做的事,
如I wish I had been able to speak to her before she died.我真希望在她去世之前跟她说上过几句话.(但事实上她已经死了,这是没实现的事情)
而这道题目中lest是"惟恐,以防",显然防的是将来可能发生的事情,所以不用B.

请教语法知识while crossing the mountain area,all the men carried g While crossing the mountain area,all the men carried guns le ---(be) more careful while crossing the road 虚拟语气问题非诚勿扰啊1.He sat with the door open all the time so that The postman noticed that two men,carring______looked like gu The postman noticed that two men,carrying_____looked like gu 英语虚拟语气 Without air ,all the living things___ not live.How I 这个是虚拟语气吗?I have come all the way from Vienna ... carried the 虚拟语气 He suggested that the meeting They carried on with the while I was away. 英语翻译we live in the mountain area,Denver area just on the eas