it is not easy to find groundwater that is clean and safe to drink的形式主语

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itisnoteasytofindgroundwaterthatiscleanandsafetodrink的形式主语itisnoteasytofindgroundwaterthatiscleanand

it is not easy to find groundwater that is clean and safe to drink的形式主语
it is not easy to find groundwater that is clean and safe to drink的形式主语

it is not easy to find groundwater that is clean and safe to drink的形式主语
it is not easy to find groundwater that is clean and safe to drink的形式主语
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