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  3. The development of industry has A also brought B about large numbers of problems C which have D to solve.

The development of industry has A also brought B about large numbers of problems C which have D to solve.

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问题 The development of industry has A also brought B about large numbers of problems C which have D to solve.
选项 A、 
B、 
C、 
D、 
答案D
解析 应改为to be solved。
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