问题
选择题
___ the employees' working efficiency, the supervisor will allow them to have a coffee break.
A．Improving
B．To improve
C．Having improved
D．Improved
答案
答案：B
考察不定式做目的状语。意思说：为了改善员工的工作效率，老板允许他们有喝咖啡休息时间.to do 可以表示为了…. 实际上等同于in order to，so as to.