At a time when it was unusual to do it, Dorothy Sterling wrote about such major figures of Black history as Harriet Tubman and W. E. B. Du Bois.
(A) it was unusual to do it
(B) it was unusual to do so
(C) doing that was unusual
(D) that was an unusual thing to be doing
(E) it was not usual to do
答案是B
想請問一下C錯在哪裡?我的想法是C是省略子句,原句是when (Dorothy Sterling) do(ing) that was unusual,Dorothy Sterling wrote about such major figures of Black history as Harriet Tubman and W. E. B. Du Bois.that代替藍色字體的部份
,還有B的it是代什麼呢?還是只是虛主詞?
煩請大家指點一下,感激不盡囉
