factory inspectors recommended that new safety rules ____A could have reached B should have reached C need have reached D must have reached汗....A should introduce B would be introduced C introduced D be introduced

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factoryinspectorsrecommendedthatnewsafetyrules____AcouldhavereachedBshouldhavereachedCneedhavereache

factory inspectors recommended that new safety rules ____A could have reached B should have reached C need have reached D must have reached汗....A should introduce B would be introduced C introduced D be introduced
factory inspectors recommended that new safety rules ____
A could have reached B should have reached C need have reached D must have reached
汗....
A should introduce B would be introduced C introduced D be introduced

factory inspectors recommended that new safety rules ____A could have reached B should have reached C need have reached D must have reached汗....A should introduce B would be introduced C introduced D be introduced
D be introduced
recommend,suggest等+that sb(should)do,从句要用虚拟语气,shoul可省略
这题表被动,选D
新的安全规则应该被引进

D
recommend 建议后面跟的从句,从句中要用虚拟语气,should+do,should可以省略,而introduce在这里为被动:被制定(引申义)
因此选D

B
recommend 建议后面跟的从句,从句中要用虚拟语气,should+do
因此选B
句意:工厂检验员建议新的安全规则应尽快达成。