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Although the theory of continental drift was not widely accepted until the mid-twentieth century, the basic concept had been described as early as 1620.

A. was not widely accepted until the mid-twentieth century, the basic concept was

B. was not widely accepted until the mid-twentieth century, the basic concept had been

C. had not been widely accepted until the mid-twentieth century, the basic concept was

D. None

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সঠিক উত্তরঃ B. was not widely accepted until the mid-twentieth century, the basic concept had been

Explanation: