Between 14,000 and 8,000 B.C. the ice cap that covered northern Asia, Europe, and America began to melt, uncovering vast new areas that were to be occupied by migrating peoples moving northward.
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Abegan to melt, uncovering vast new areas that were to be occupied
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Bbegan melting, to uncover vast new areas to be occupied
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Cbegan, by melting, to uncover vast new areas for occupation
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Dbegan, after melting, uncovering vast new areas which are to be occupied
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Ewould begin to uncover, through melting, vast new areas for occupation
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正确答案: A