OG上的一道题, 求大佬解答。technically, " quicksand " is the term for sand that is so saturated with water as to acquire a liquid character. 答案说这个选项错是因为没有subject。所以选 technically, " quicksand " is the term for sand that is so saturated with water that it acquires the character of a liquid. 想问问第一个和第二个clause中的 subject和verb 分别是什么呀?第二个句子当中的“it”会不会存在pronoun 指代ambiguity的问题呢?