2. 外语
  3. At a time when it was unusual to do it, Dorothy Sterling wrote about such major figures of Blacks, history as Harriet Tubman and

At a time when it was unusual to do it, Dorothy Sterling wrote about such major figures of Blacks, history as Harriet Tubman and

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问题 At a time when it was unusual to do it, Dorothy Sterling wrote about such major figures of Blacks, history as Harriet Tubman and W.E.B Du Bros.
选项 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B
解析 A中to do it应改为to do so；C、D中that单独作指示代词违背了公理中相关原则；E中：not usual不如用unusual，do之后缺so。
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