It was inevitable that this primacy should have narrowed as other countries grew richer. Just as inevitably，the retreat from predominance proved painful.
表示“建议、请求、命令、要求”等主观意向的词（如：suggest、advise、assume、decide、demand、desire、insist、propose、order、recommend、require、suggest……），引导宾语从句时需用虚拟语气。虚拟语气中的格式很固定：谓语动词用should+动词原形，should可以省略。注意这种句型中的虚拟语气形式不受主句动词时态的影响。Theories concerning on the individual suggest that children engage in criminal behavior because they were not sufficiently penalized for previous misdeeds or that they have learned criminal behavior through interactions with others.（2004 CLOSE）此句是个含有一个宾语从句、两个原因状语从句的复合句。suggest是主句谓语，Suggest后面的宾语从句中的谓语动词engage in前面省略了should.
Such behaviour is regarded as “all too human”，with the underlying assumption that other animals would not be capable of this finely developed sense of grievance.