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Since the 1940's the farms and ranches of the Great Plains [#permalink]
26 May 2006, 20:50
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10. Since the 1940's the farms and ranches of the Great Plains have been supplied with water from the Ogallala aquifer; this underground reservoir contained an estimated quadrillion gallons of water, which equal Lake Huron, but now reserves are becoming depleted.
(A) which equal Lake Huron
(B) which equal Lake Huron's
(C) equal to Lake Huron's
(D) the equivalent of Lake Huron's
(E) the equivalent of Lake Huron
It's not just a straight comparison between Ogallala aquifer and Lake Huron. It's the comparison of the volume of water"...an estimated quadrillion gallons of water" that needs to be compared to the 'volume' of Lake Huron (i.e. hence the possessive tense of 'Lake Huron's')
So I think it's down to B or D. I have a feeling that it should be D with the 'equivalent of' and not 'equal to'.
But can someone better articulate why it should be D and not B?