Jean Wagner’s most enduring contribution to the study of Afro-American poetry is his insistence that it______in religious, as we

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问题 Jean Wagner’s most enduring contribution to the study of Afro-American poetry is his insistence that it______in religious, as well as worldly, frame of reference.

选项 A、is to be analyzed
B、has been analyzed
C、be analyzed
D、should have been analyzed