Only C is OK of the first set and only #3 of the second. The noun ('point'/'time') and fronted preposition ('at which') are both needed.
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Mister MicawberThe noun ('point'/'time') and fronted preposition ('at which') are both needed.
IvanhrWhich" requires a noun when used adjectively.
English 1b3IvanhrWhich" requires a noun when used adjectively.
Hi,
I played soccer for five years, during which