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SAT语法题求助Although both(A) birds are known for their distincti

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SAT语法题求助
Although both(A) birds are known for their
distinctive(B) songs,but the rufous songlark
has a sweeter(C) song than has(D) the
brown songlark.No Error(E)
我明白although 和but的错误了,但是D的has也很奇怪阿!
SAT语法题求助Although both(A) birds are known for their distincti
has 有点奇怪,因为它是倒装.
 
在than引导的比较状语从句中,从句的主语比较长的情况下,通常会倒装,目的是为了保持句子结构平衡,避免头重脚轻.
 
更多例子:
Flying demands a much greater supply of energy than 【do】 most other forms of transportation.(和其它绝大多数的运输形式相比,空运更耗油.)
The molecules of gases move more freely than 【do】 those of liquids and solids.
(和液体和固体的分子相比,气体的分子移动更容易.)
Copper wire allows a larger current than 【does】 iron wire.
(和铁丝相比,铜丝允许更大的电流通过.)