Grammar Quiz

[ TOEFL Adjective and Adverb ]

. . . . chief advantage of renewable energy sources is their sustainibilty

A. By the

B. The

C. It is the

D. That the

Select your answer:
         


Random Topics:

Past Progressive TensePresent or Past TensesGerundSimple Past Tense and Present Continuous TenseGrammar SuffixesIf Conditional Zero and OneInfinitive and GerundsCity Places-ed/-ing Adjectives

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a. cleans

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