Directions: Generally, there are four basic types of opening sentences for an abstract. Can you match the following opening sentences with its category?
 The aim of this study is to examine the effects of the recent change in corporate taxation.
A、Starting with a real-world phenomenon or with standard practice
B、Starting with purpose or objective
C、Starting with present researcher action
 
D、Starting with a problem or an uncertainty
Directions: Generally, there are four basic types of opening - Chapter 11 Writing Abstract and Key Words - 学术英语论文写作 - U校园 | 大学网课搜题引擎