31．--What a hard problem! --Let’s ask Bob．Maybe he will with a good solution to it． A．come u——青夏教育精英家教网—

摘要：31．--What a hard problem! --Let’s ask Bob．Maybe he will with a good solution to it． A．come up B．make up C．catch up D．set up

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--What a hard problem!

--Let's ask Bob．Maybe he will with a good solution to it．

A．come up B．make up C．catch up D．use up

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