Regarding the four sentences below, are they all correct in terms of grammar? Besides, please evaluate each of them, depending on whether it is natural or not.
(A) Copper is twice as expensive today as it was several years ago. (B) Copper is twice as expensive as it was several years ago. (C) Copper is twice as expensive today as several years ago. (D) Copper is twice as expensive as several years ago.
Comparative construction
Top answer
All are fine and natural.
— Mister Micawber
All are fine and natural.
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