2020 天津 第 8 题 单选题 区分题 2020_天津卷 (英语) 7.According to Professor Johnson, we don’t have to read the book if we don’t want to, as it is ______. A. worthwhileB. necessaryC. optionalD. serious 参考答案C ☆ 收藏不会,直接看解析查看原卷 →