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.

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সঠিক উত্তর: was not widely accepted until the mid-twentieth century, the basic concept had been। ব্যাখ্যা:

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.

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