问题描述：
英语语法试题
Jean Wagner's most enduring contibution to the study of Afro-American poetry is his insistence that it _____ in a religious ,as well as worldly ,frame of reference .A is to be analyzed B were analyzed C be analyzed D should been analyzed
Jean Wagner's most enduring contibution to the study of Afro-American poetry is his insistence that it _____ in a religious ,as well as worldly ,frame of reference .A is to be analyzed B were analyzed C be analyzed D should been analyzed
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