[求助]大全507

mialanhero

大全507.Modern critics are amused by early scholars’ categorizing Tacitus’s Germania as an ethnographic treatise.
(A) scholars’ categorizing Tacitus’s Germania as
(B) scholars’ categorizing Tacitus’s Germania as if
(C) scholars, categorizing of Tacitus’s Germania as
(D) scholars who categorize Tacitus’s Germania as
(E) scholars who categorize Tacitus’s Germania if 答案是A，我想问问XDF上课时说sb's doing sth在GMAT中永远错，为什么这里是对的？ 以前的帖子好像讲得不清楚，还望NN们帮忙！