第17题: [单项选择]The book you want is not ______ now. I will let you know as soon as it is returned to the library. A. useful B. possible C. available D. practical 参考答案:C 答案解析:[考点] 形容词 [解析] useful“有用的”;possible“可能的”;available“可用的,有效的,可买到的,可借到的”;practical“实际的,实用的”。