It's C, object of the preposition. But we usually put the preposition after the verb from the relative clause: "I met the friend whom I had exchanged many letters with" .
Answer:
An important notion is that of conjugate partitions.
Explanation:
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It should b c that he was wronged by the king
Answer:D
Explanation: I say D because if the text was written in problem and solution the text will provide the reader with a problem and a solution about breaking the food chain
I believe the answer is D. The reason I said D is because the craziest party is describing have been.