[ Tenses Usage ]
None of the renewable energy sources _____ completely free from environmental impact.
A. is
B. are
C. has been
D. have been
Select your answer:
Random Topics:
Adverb of Frequency and Past Continuous TensePrepositions & Prepositional PhrasesModal AuxiliariesInfinitives and GerundsSo or SuchIntermediate PrepositionsOn, At, ByVerbs: Action, Linking, and HelpingConjunctions - ConnectorsFuture - Will and Be going toOther quiz:
Grammar › ViewMy laptop was broken, and ……………….. his laptop.
A. Also was
B. So was
C. So did
D. Neither was
Grammar: Defining Relative Clauses › View
I have a friend _____ speaks four languages.
A. that he
B. which
C. who