第22题: [单项选择]Water enters into a great variety of chemical reactions, ______ have been mentioned in previous pages. A. a few of it B. a few of them C. a few of that D. a few of which 参考答案:D 答案解析:本题考查定语从句。该句意为“水参与大量的化学反应,其中有几个在前几页中已经提及”。非限制性定语从句和主句之间一般以逗号隔开,由which,who,whose引导,也可用when, where,as来引