Topics: 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:
Grammar - Present Perfect TensePast or Present Verb TenseLinking VerbComparative and Superlative AdjectivesWh- Questions Present Simple TenseNoun Phrases and AdverbialsSubject, Object, Possessive Pronoun and Possessive AdjectivesModals of PredictionGerunds, Infinitives and ParticiplesTransitive or Intransitive VerbsOther quiz:
Grammar and Vocabulary › ViewWhich of the following sentences is declarative?
A. Don’t forget to bring your homework.
B. Close the door quietly.
C. Last summer I went on a long trip.
D. How beautiful the sunset is!
Homonyms › View
The heart is a ___ of love.
a. symbol
b. cymbal