[ Grammar ]
I _______ there once a long time ago and _______ back since.
A. was/ have not been
B. had been / was not
C. would be / had not been
D. have been / will not be

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Formal & Informal WordsPresent Perfect Simple and ContinuousModal Verbs for SpeculationConnectives (because, due to, owing to, because of)Noun, Pronoun, Adjective, VerbModals with Perfect InfinitiveIrregular Plural NounsTOEFL GrammarPast Tense and NeutralPast and Future TensesOther quiz:
Grammar › ViewIf we had started using solar energy earlier, the planet _________ now.
A. would be less polluted
B. would have been less polluted
C. would being less polluted
Tenses › View
I … my best friend since primary school.
A. has known
B. know
C. have known
D. knew