[求助]

ncwang2004

[求助]GWD7-15

Q15:

The city has proposed a number of water treatment and conservation projects the cost of which raises water bills high enough so that even environmentalists are beginning to raise alarms.

1. the cost of which raises water bills high enough so that
   

   
   

2. at a cost raising water bills so high that
   

   
   

3. at a cost which raises water bills high enough so
   

   
   

4. whose cost will raise water bills so high that
   
   
5. whose cost will raise water bills high enough so that

这题答案是D，我老是感觉will raise 和后面的are beginning 时态上不大对应， nn们请指点一下哦，大家都认为b错在a cost 上吗，有没有新看法

欢迎讨论！

joe11

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ncwang2004

早check 过了，没谈到此时态的问题。