Prep08 214

loveeyore

Scholars who once thought Native American literatures were solely oral narratives
recorded by missionaries or anthropologists now understand this body of work to
consist of both oral literatures and the written works of Native American authors, who
have been publishing since 1772.
A. Scholars who once thought Native American literatures were solely oral
narratives
B. Scholars thinking of Native American literatures once solely as oral narratives,
and
C. Scholars who once had thought of Native American literatures solely as oral
narratives and
D. Native American literatures, which some scholars once thought were solely
oral narratives
E. Native American literatures, which some scholars once, thinking they were
solely oral narratives

为什么是who haven been publishing? 是修饰Native American authors？为什么用passive continuous?谢谢。