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What they all have in common is that they combine fun with the opportunity to learn ,something. 【查看更多】

 

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____ they all have in common is that they combine fun _____ the opportunity to learn something.  
[     ]
A. What; with      
B. What; on        
C. Which; with    
D. Who; for

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________ they all have in common is that they combine fun ________ the opportunity to learn something．

[　　]

A．What; with

B．What; on

C．Which; with

D．Who; for

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