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SAT语法Though strip-mining often caused irreparable damage to

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SAT语法Though strip-mining often caused irreparable damage to the natural environment,it was...
A)Though strip-mining often caused irreparable damage to the natural environment,it was once used to supply half the coal produced annually in the United States.
B)In spite of often irreparable damage to the natural environment,strip-mining was once used to supply half the coal produced annually in the United States.
我明白A对,但是为什么B错啊?
In spite of often irreparable damage to the natural environment这部分本应该是独立主格结构

所以就错在这个地方

改成(with) its often irreparable damage to the natural environment
再问: 为什么in spite of就不行了,这里不是表示转折吗?
再答: 意思是表转折的,但是语法上不符合独立主格的用法 独立主格有他的模式,就是with +名词+(形容词,介词,分词,不定式,等等)
再问: 为什么一定要独立主格?
再答: with its often irreparable damage to the natural environment 这部分的主语是损害,名词的damage strip-mining was once used to supply half the coal produced annually in the United States. 这部分的主语是露天开矿 两个主语不一致