Question

The teachers really didn’t know _____ students would pass the final exam.

the which of
of which the
which of the
in which the
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Answer 1

The teachers really didn’t know which of the students would pass the final exam.

Basically a grammar should be correct in everything.

Based on that only, one can able to decide whether this one is correctly used or not.

With that, here it have been clearly stated as a accurate answer.