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标题: [求助]GWD-XY4上的一道改错题 [打印本页]

作者: Lareina873 时间: 2008-10-20 22:13
标题: [求助]GWD-XY4上的一道改错题

Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve metropolitan Boston.

Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve
Concerns about public health have led to the construction of three separate sewer systems between 1876 and 1904 to serve
Concerns about public health have led between 1876 and 1904 to the construction of three separate sewer systems for serving
There were concerns about public health leading to the construction between 1876 and 1904 of three separate sewer systems serving
There were concerns leading between 1876 and 1904 to the construction of three separate sewer systems for serving

正确答案是A 想了半天还是不知道为什么Ｂ会错　　请牛人们指教！

作者: lawrence0707 时间: 2008-10-20 22:32
是不是时态的问题啊

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