The professor could not understand _____ most of the students ...

[ Grammar for TOEFL ]

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,

Select your answer:
A B C D E

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