with many efforts_____, they solve the problemA to make B to do C made D done

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with many efforts_____, they solve the problemA to make  B to do  C made  D done

with many efforts_____, they solve the problemA to make B to do C made D done
with many efforts_____, they solve the problem
A to make B to do C made D done

with many efforts_____, they solve the problemA to make B to do C made D done
选c吧,make efforts 是固定词组,因后面说他们解决了问题,那应该用made,表做了努力.

c