A.
where = in which = in the conversations.
把這個(gè)復(fù)合句拆開(kāi)成兩個(gè)簡(jiǎn)單句,你不用關(guān)系副詞/代詞,而用人稱代詞或重復(fù)相同的名詞（短語(yǔ)）：
1.When.,we like to have conversations.
2.----we give information or opinions about different things.
告訴我：----we.前面你打算填什么?才能和前句銜接起來(lái)?
當(dāng)然是：In the/ our conversations we give.things.
好了,在用關(guān)系代詞或關(guān)系副詞把這兩句合并,還原成原句吧!
In the/ our conversations = in which = where
合起來(lái)：When...,we like to have conversations where we give.
如果,B,加個(gè) in ,即,in which,當(dāng)然是可以的.
明白了,給個(gè)回答.