After several fruitless attempts, the new approach ______ the tough problem was

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问题 After several fruitless attempts, the new approach ______ the tough problem was considered as the last resort.

选项 A、to solve
B、with solving
C、to solving
D、for solving

答案 C

解析

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Theproblem______successisthatbythetimeyouarerichenoughtosleeplate