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729. Many utilities obtain most of their electric power from large coal and nuclear operations at costs that are sometimes two to three times higher as that of power from smaller, more efficient plants that can bothmake use of waste heat and take advantage of the current abundance of natural gas.
A. two to three times higher as that of power from smaller, more efficient plants that can both
B. higher by two to three times as that from smaller, more efficient plants that both can
C. two to three times higher than those for power from smaller, more efficient plants that can both
D. between two to three times higher as those for power from smaller, more efficient plants that both can
E. between two to three times higher than from smaller, more efficient plants that they can both
解析：
考点：比较和Both...and平行
比较级+than的机构，Higher这个比较级的固定搭配是than
Both...and平行，这块can应该在both前面
E选项than后面跟的是介词短语，缺代词，比较对象不清楚
答案：C
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