[國中] 請幫我解這題關代

[charizma (一切徒勞)]

學生跑來問我
We decided to go to the park _____ he told us.
1) X 2) where  3)which

答案是：X
請問2)為什麼不行呢？
請各位高手幫我解惑一下～
感謝大家！

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推 outofdejavu:"where" here can be expanded to "[prep.] + which".
推 outofdejavu:"We decided to go to the part in which he told us"
→ outofdejavu:=> This sentence seems to be imcomplete ─ told us
→ outofdejavu:what?
→ outofdejavu:& Both 1 and 3 are okay to be filled in the blank.
推 outofdejavu:Well, I should say "both 1 and 3 are possible
→ outofdejavu:answers."
→ charizma:Thanks a lot~