Although various eighteenth- and nineteenth-century American poets had professed an interest in Native American poetry and had pretended to imitate Native American forms in their own works, until almost 1900, scholars and critics did not begin seriously to study traditional Native American poetry in native languages.
until almost 1900, scholars and critics did not begin seriously to study
until almost 1900 scholars and critics had not begun seriously studying
not until almost 1900 were scholars and critics to begin seriously to study
it was not almost until 1900 when scholars and critics began to seriously study
it was not until almost 1900 that scholars and critics seriously began studying
补充一点:强调句强调时间状语Or地点状语,貌似也是用that;没有用when 或者 where,个人感觉,没查证过
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