moon7296 1. That's the gas station at which I'm working now. 1.
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moon72961. That's the gas station at which I'm working now.
1.1. That's the gas station which I'm working at now.
2. That's the gas station where I'm working now.
2.1. That's the gas station where I'm working at now.
It is said, preposition + which(an adverbial relative clause) can become where, when, or why.
Q) Then, can't No.2.1 be grammatical?