11. If a better material ____, the strength of the part would have been increased. (QE92-58)

        A. had been used    B. had been using    C. being used    D. using

        【答案】A 本句考察虚拟语气。与过去事实相反的假设，从句应该用过去完成时;又因为material 是use 的宾语，应用被动式。

        12. If you     that night, you might have been too late to get your ticket. (QE94-38)

        A. didn't hurry    B. hadn't hurried       C. wouldn't hurry      D. hadn't to hurry

        【答案】B 从给出的主句看，本句为虚拟语气，架设过去已发生的事情，因此从句用过去完成时。

        13. With all this work on hand, she ______ to the dance party last night. (QE06-11-30)

        A. oughtn’t to go    B. hadn’t gone   C. shouldn’t have gone   D. mustn’t have gone

        【答案】C 原句意思“她手头还有这么多工作，昨晚本不应去参加舞会”，对过去情况的虚拟用 “should have done”结构。

        14. He abandoned a career that ___ to his becoming one of the most influential people in the world. (QE05-11-33)

        A. could have led    B. would lead   C. should have led    D. must lead

        【答案】A 本题考查情态动词表示虚拟语气的用法。与过去事实相反，是could/should have done，本可能/本应该做…（但实际没这样做）。因为是客观情况，不涉及是否应该，所以选择A could have done.

        15. If we ____ here ten minutes earlier, we ___ the bus.

        A. arrived/would catch     B. arrived/would have caught   

        C. had arrived/had caught   D. had arrived/would have caught 

        【答案】D。如果我们早10分钟到，就赶上公交车了。If条件句对过去的虚拟。

        16. ____ you were busy, I wouldn’t have bothered you with my questions. (QE96-39)

        A．If I realized                      B. Had I realized

        C．Did I have realized that             D. As I realized

        【答案】B 本题考察的是与过去事实相反的虚拟语气.条件状语从句谓语动词用had +过去分词,主句谓语动词用,should/would/could/might +have + 过去分词.当省略if 时,条件从句中的had 提前. 句意是“如果我意识到你这么忙,我就不拿我的这些问题来打扰你了.”

        17. ___, I should ask them some questions. (QE97-30)

        A. Should they come to us     B. If they come to us

        C. Were they come to us      D. Had they come to us

        【答案】A 本题考查的是省略if的虚拟语气的用法。从句中的助动词had, were, should等要移至主语之前。如果他们来到我们身边，我会问他们一些问题。

        18. Had the weather been good, the children ___ out for a walk. (QE01-57)

        A. had gone   B. could have gone   C. would go    D. went

        【答案】B。当虚拟语气中含有were, had, should, would等词时， 可以省略if, 把这些词放在主语之前。Should I meet her, I would tell her.万一我见到他， 我会告诉他的。Were I in your position, I would do it better.如果我处在你的位置上， 我会做的更好。Had they made preparations, they would have succeeded.如果他们准备了的话， 他们应该能成功的。本句为和过去的事实相反的虚拟语气，因此选B。

        19.  ___ today, he would get there for holiday.

        A. Was he leaving   B. Were he to leave   C. Would he leave   D. If he leaves

        【答案】B。如果他今天走的话，他就在那里度假了。对将来的虚拟。

        20.  We ___ our lives had it not been for the policeman.

        A. would have lost   B. should lose       C. might lose       D. could have lost

        【答案】A。要不是警察，我们都已经没命了。从句对过去，主句对现在。