[ Tenses ]
Over the past fifty years, global oil comsumption and CO2 levels —- proportionally.
A. are increasing
B. will have been increasing
C. have been increasing
D. had been increasing
E. were increasing
Subject-Verb AgreementConjunctionZero ConditionalEd and Ing EndingsGrammar / PronounsDependent ClausesPast TenseGerundsCorrelative Conjunction & Complex Sentences
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