Over the past fifty years, global oil comsumption and CO2 ...

[ 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

Select your answer:
A B C D E

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Subject-Verb Agreement Conjunction Zero Conditional Ed and Ing Endings Grammar / Pronouns Dependent Clauses Past Tense Gerunds Correlative Conjunction & Complex Sentences

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