Although various eighteenth-and nineteenth-century American poets had professed an interest in Native American poetry and pretended to imitate Native American forms in their own works,until almost 1900,scholars and critices did not begin seriously to study tranditional Native American poetry in native languages.
D it was not almost until 1900 when scholars and critics began to seriosly study
E it was bot until almost 1900 that scholars and critics seriously began studing
正确答案是E,我想问一下E中it was ...that..是属于强调句嘛,那D中it was...when这种形式对不对呢??