多选题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多选题Directions: Generally, there are four basic types of opening sentences for an abstract. Can you match the following opening sentences with its category? The relationship between corporate taxation and corporate strategy remain unclear. 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简答题Directions: Generally, there are four basic types of opening sentences for an abstract. Can you match the following opening sentences with its category? We analyze corporate taxation returns before and after the introduction of the new tax rules. 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简答题Directions: Generally, there are four basic types of opening sentences for an abstract. Can you match the following opening sentences with its category? Economists have long been interested in the relationship between corporate taxation and corporate strategy. 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