托福考试

根据网考网考试中心的统计分析，以下试题在2017/6/18日托福考试习题练习中，答错率较高，为：33%
【单选题】 All the major cities of the United States, （）_ the cities of the Great Lakes and the Gulf of Mexico, began as centers of trade. 
A. and to include 
B. which including 
C. included 
D. including 

网考网参考答案：D，答错率：33%
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