From the 60`s to the 90`s, each decade saw more oil consumed than in previous human history; for instance, in the 70`s, the US used twice as much as they had in the 60`s, in the 80`s twice as much as they had in the 70`s, and so on.
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Atwice as much as they had in the 60`s, in the 80`s twice as much as they had
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Bdouble the amount as they did in the 60`s, in the 80`s double the amount as they did
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Ctwice as much as it did in the 60`s, in the 80`s twice as much as it did
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Ddouble the amount as it has in the 60`s, in the 80`s double the amount as it has
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Etwice as much as they had in the 60`s, in the 80`s twice as much as they had
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正确答案: C