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  3. There are A many valuable services which the public B are willing to pay for, but C which D does not bring a return in money to

There are A many valuable services which the public B are willing to pay for, but C which D does not bring a return in money to

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问题 There are A many valuable services which the public B are willing to pay for, but C which D does not bring a return in money to the community.
选项 A、 
B、 
C、 
D、 
答案D
解析 应改为do not，第二个关系代词which在分句中做主语，指代前面的先行词services。
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