解答

兩個單獨的句子。
How you ever been to the restaurant?
They are talking about the restuarant.

可以寫成
(1)How you ever been to the restaurant «which» they are 【talking about】.

(2)How you ever been to the restaurant «about which» they are 【talking】.

(3)How you ever been to the restaurant «where» they are 【talking】.

簡言之,以下皆可:
(1)只寫which。
(2)把後句的介係詞搬來變成about which。
(3)或是寫where同時後句介係詞不寫。

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後面是不完整句,需要關係代名詞作為子句的受詞。

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他們講的就是那間餐廳,餐廳是地,用which ,in which=where

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