_____ there is no shortage of fresh water, wastewater is ...

[ Word Form & Verb Tense ]

_____ there is no shortage of fresh water, wastewater is treated and turned into drinking water

A. ensure

B. to ensure

C. ensured

D. ensuring

Select your answer:

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Definite Articles Present Perfect & Past Simple Tense Conjunctions & Cohesive Devices Much, many, a lot of, a few, a little Have to/Has to Past Simple, Past Continuous, Past Perfect, Past Perfect Continuous Modal Verbs and Conjuctions Asking & Giving Opinion Relative Clauses and etc

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