The Usage of During Which, At Which, and Of Which

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Dear Teacher:
I'm still at sea with the usage of during which, at which and of which, allowing for the fact that English is my second language. I was hoping that you could show me the ropes in terms of usage. I'd be grateful if you could help me sort it out.

All the best.

Usage asked Dec 10 '13 at 17:56 tet brent New member

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