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  3. The development of industry has Aalso brought Babout large numbers of problems Cwhich have Dto solve.

The development of industry has Aalso brought Babout large numbers of problems Cwhich have Dto solve.

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问题 The development of industry has Aalso brought Babout large numbers of problems Cwhich have Dto solve.
选项 A、 
B、 
C、 
D、 
答案D
解析 应改为to be solved。
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