If the American government the expert’s suggestion, the world economy would not be in such a mess now.
A. followed
B. follows
C. should follow
D. had followed
网友回答
A. followed
B. follows
C. should follow
(答案→)D. had followed
解析：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。