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van7
:
5年前
形式宾语，真正的宾语是to estimate。同理，it is difficult to do sth 这里的it也是形式主语，真正的主语是to do sth
E 找不到具体的错误，感觉主要是不如C简洁?
應該就是簡潔! This choice does not clearly convey the idea that the Anasazi employed patterns of light and shadow for the purpose indicated. Furthermore, at a recently discovered place that the Anasazi . . . once used the site as an observatory unnecessarily inserts the site, which is redundant (with place) and renders the sentence grammatically incorrect.
从句多了一个the site呀
是语意的问题吧，语意重点是site，而不是patterns，site放句首更优。