Had the governments and scientists not worked together, AIDS-related deaths ________ since their highest in 2005. --优优班--学霸训练营

Had the governments and scientists not worked together, AIDS-related deaths ________ since their highest in 2005.

A．had not fallen

B．would not fall

C．did not fall

D．would not have fallen

【考点】与过去事实相反的假设,省略if的条件句

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【解答】请登陆后查看

难度：较易

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