Question 1:
....... fairness to those who worked on the project for the past 18 months, I have to offer the promotion to one*^*of them before I can even think of offering it to you. I have to be fair to the employees who worked so hard on*^*the project and you didn't help out at all.
A. In
B. On
C. Under
D. Out

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Prepositional Phrases - On, In, Under and Out (8) | C1 – Advanced