the key to solve the problem is to _____ treesplant 还是 planting

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thekeytosolvetheproblemisto_____treesplant还是plantingthekeytosolvetheproblemisto_____treesplant还是plan

the key to solve the problem is to _____ treesplant 还是 planting
the key to solve the problem is to _____ trees
plant 还是 planting

the key to solve the problem is to _____ treesplant 还是 planting
plant
这里to是不定式,后面接 to do