The professor could not understand _____ most of the students failed the exam despite the fact that the material had been thoroughly discussed in class and additional study sessions were provided.
A. why
B. if they were paying attention during the lectures,
C. while he was explaining the difficult parts,
D. because they seemed well-prepared during the review,
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_______ the meeting starts, I will prepare a detailed report on our sales performance and future projections to ensure we have all the necessary data.
A. After everyone has gathered,
B. While we are still waiting for the other departments to submit their reports,
C. Before
D. Since the manager will not be available afterward,
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