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It has been rather costly to install the machinery， but it will prove to be worth the money ___.
A、in the long run
B、in conclusion
C、at long last
D、at the end
【正确答案】：A
【题目解析】：in the long run从长远来看。句意：安装这台机器成本很高，但从长远来看，它将证明是物有所值的。