If the American government      the expert’s suggestion, the world economy would not be in such a mess now.
A．followedB．follows
C．should followD．had followed
D

試題分析：考查if的虛擬條件句：句意：如果美國政府聽從專家的建議，世界經(jīng)濟(jì)就不會像現(xiàn)在這么混亂了。從句是和過去相反，用過去完成時，主句是和現(xiàn)在相反，用would do。選D。
點評：if的虛擬語氣非常重要，簡要概括如下：1、表示與現(xiàn) 在事實相反的情況，從句：If主語+過去時(Be動詞用were)；主句：主語+should/would/could/might+do：　2、表示與過去事實相反的情況，從句：If主語+had+done；主句：主語+should/would/could/might+have done　3、表示對將來情況的主觀推測，從句：①if+主語+were to do②if+主語+should+do ③if+主語+did（動詞過去式）/were ；主句：主語+should/would/could/might+do　
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