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 - Tenses | English Grammar Quiz

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

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