题目内容

12．Had the governments and scientists not worked together，AIDS-related deaths _______ since their highest in 2005．（　　）
A．had not fallenB．would not fall
C．did not fallD．would not have fallen

分析 如果没有政府部门和科学家们的共同努力，与艾滋相关的死亡就不会从2005年的最高点下降．

解答 答案：D
根据题干从句中had置于句首可知，此处为虚拟语气中连词if省略情况．由从句中谓语动词had not worked（had done）可知，是对过去情况的假设，所以主句中的谓语动词应用would/could/might/should have done来表示对过去情况的假设．故选D．

点评 当虚拟条件句的谓语动词含有were，should，had时，if可以省略把if省略，从句用倒装语序，即把were，should，had提前．解此题时需先认清此句是if省略的倒装情况，再根据从句的谓语动词形式确定是对什么时间的假设，进而确定主句的谓语动词形式．

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