一、although+clause,其前或后必须接clause,而不是名词,所以OG说D的construction有问题。 二、although表示contrast,如果用...crests that remain stationary although they are formed by rapidly moving air,没有对比。如果用...crests that remain stationary although the air that forms them is moving rapidly,一个remain stationary,一个moving rapidly,对比就很到位。 三、althoug,while,and前后连接两个句子时,如果前后两个句子的主语都可以是同一个人,最好用同一个人做前后的主语。比如OG里有个题Long before it is fashionable to be a expatriate, Lura made Paris her home, and she lived there for...。因为后一个句子的主语是she,在条件容许的情况下,第一个句子的的主语最好用she以求对称。OG里还有个题...the inflation cease while it is expected to rise,选项中有its rise is expected,但从前面说得那个语法点来说,选it(inflation)是最好的。  S:本题不在第三点考虑之中 |