- They are doubtful about its necessity.
出自-2012年12月閱讀原文
- Americans are less doubtful when it comes to politics: 73% expect to see a female president in their lifetime.
2019年6月四級真題（第二套）閱讀 Section C
- Somewhat doubtful.
出自-2016年6月閱讀原文
- It's doubtful that a computer program can do that—at least, not without some undesirable results.
2017年12月六級真題（第二套）閱讀 Section C
- Yet like many college teachers around the U.S., the faculty remain doubtful that their work as educators can be measured by a "learning outcome" such as a graduate's ability to investigate and reason.
2017年6月六級真題（第一套）閱讀 Section A
- One reason is that, according to findings of a new survey of office workers conducted by wakefield research for the it company citrix, most bosses are doubtful about remote working.
2016年高考英語浙江卷（10月） 閱讀理解 閱讀C 原文
- And whether the community's work contributes much to an overall accumulation of knowledge is doubtful.
出自-2013年考研閱讀原文