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14、So difficult _______ that no one could ______ a good solution to it.      

A.was the problem; come up with                   B.the problem was; come up with

C.the problem was; put up with                       D.was the problem; put up with

14、A

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So difficult _______ that no one could ______ a good solution to it.      

A.was the problem; come up with                   B.the problem was; come up with

C.the problem was; put up with                       D.was the problem; put up with

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