___ the employees' working efficiency, the supervisor will allow them to have a coffee break.
A．ImprovingB．To improveC．Having improvedD．Improved
B
考察不定式做目的狀語。意思說：為了改善員工的工作效率，老板允許他們有喝咖啡休息時(shí)間.to do 可以表示為了…. 實(shí)際上等同于in order to，so as to.
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