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 如果沒有政府部門和科學家們的共同努力，與艾滋相關的死亡就不會從2005年的最高點下降．

解答 答案：D
根據(jù)題干從句中had置于句首可知，此處為虛擬語氣中連詞if省略情況．由從句中謂語動詞had not worked（had done）可知，是對過去情況的假設，所以主句中的謂語動詞應用would/could/might/should have done來表示對過去情況的假設．故選D．

點評 當虛擬條件句的謂語動詞含有were，should，had時，if可以省略把if省略，從句用倒裝語序，即把were，should，had提前．解此題時需先認清此句是if省略的倒裝情況，再根據(jù)從句的謂語動詞形式確定是對什么時間的假設，進而確定主句的謂語動詞形式．

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