We know that the Black Sea, one thousand years ago, was a fresh water lake about ________ and unconnected with the Mediterranean
A.its two thirds present size
B.two-thirds size of the present
C.its two-thirds of the present size
D.two- thirds its present size
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D解析考查倍数和分数的表达问题。“某物以前的大小/长度/宽度/深度是现在的几倍/几分之几”的表达法：基数词+times/分数 its present size/length/width/depth”，注意，这个结构是没有of的。选D。