The Mississippi riverboat, which evolved(A)) from simpler steamship (B) of the early 1800's, became the dominant (C) form of passenger transport (D)on the Mississippi River.
对于这道题,我一点思路都没有,那位大侠给解释解释吧
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个人理解:
B错,因为steamship是可数名词,而它前面没有任何冠词,因此错了。可改为steamships
呵呵,建议看看语法区PP语法笔记
好运!
答案告诉是simpler steamship (B)错了
但是和前面的逻辑主语的数不一致Mississippi riverboat的说
估计是题目本身的问题
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