题目内容
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
B. the problem was; come up with
C. the problem was; put up with
D. was the problem; put up with
A
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