25. If you had not studied the problem carefully until recently， _____ . A、you will find any difficulty now B、you would have found any difficulty now C、you would find any difficulty now D、you

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25. If you had not studied the problem carefully until recently， _____ .
   A、you will find any difficulty now
   B、you would have found any difficulty now
   C、you would find any difficulty now
   D、you have find any difficulty now

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