求一道SAT语法解答Contrasting with most other fifteenth-century rulers, Portuguese kings could count on the support of the aristocracy in any overseas ventures.答案是把头上改成Contrasted with. 为什么这里用被动.我在朗文词典上看到这样的例句：The snow was icy and white, contrasting with the brilliant blue sky.他比是自己跟别人比,又不是被比较.字典里查出来contast作动词有两个意思：1.使对比,使对照 vtIt is interesting to contrast the two proposals. 2.形成对照 viHis actions contrast sharply with his promises.这里我觉得是2，第一，解释的通（用法和上面的例句一样）；第二，它是不及物的。是2的话，就是主动，就应该是CONTRASTING求详细解释 英语
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【答案】 这句中的contrast是第1个意思,contrast A with B.这种用法是个及物动词.
我们把你句中的前半句改成一个条件状语从句：
If Portuguese kings were contrasted with most other fifteenth-century rulers,
当然,你说也可以改成If we contrasted Portuguese kings with most other fifteenth-century rulers,
但是如果用第二句,主从句的主语不一致,就不能改成非谓语动词,除非用独立主格结构.和你的原题的答案明显不符.
所以用第一句,主从句的主语一致,这时,把条件状语从句改成非谓语动词：
1,去掉连词,
2,去掉主语
3,谓语是被动形式,改成了—ED形式.