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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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