If the American government the expert’s suggestion, the world economy would not be in such a mess now.A.followedB.followsC.should followD.had followed
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D解析试题分析：考查if的虚拟条件句：句意：如果美国政府听从专家的建议，世界经济就不会像现在这么混乱了。从句是和过去相反，用过去完成时，主句是和现在相反，用would do。选D。考点：考查条件句的虚拟语气
点评：if的虚拟语气非常重要，简要概括如下：1、表示与现 在事实相反的情况，从句：If主语+过去时(Be动词用were)；主句：主语+should/would/could/might+do： 2、表示与过去事实相反的情况，从句：If主语+had+done；主句：主语+should/would/could/might+have done 3、表示对将来情况的主观推测，从句：①if+主语+were to do②if+主语+should+do ③if+主语+did（动词过去式）/were ；主句：主语+should/would/could/might+do