What they all have in common is that they combine fun with the opportunity to learn ,something.——青夏教育精英家教网—

摘要： What they all have in common is that they combine fun with the opportunity to learn ,something.

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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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