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(A) which
(B) where
(C) that
(D) when

which   關係代名詞
where   副詞或連接詞

Yellow is also an important color to the Vietnamese, who use it at weddings and also on their flag, 39 it represents courage, victory, and sacrifice.

在此要用連接詞，因此選where

補充最佳解

which   為「關係代名詞」時，代替事物，用來指稱先前提過的事物

where   為「關係副詞」時，是由「介係詞 + 關係代名詞」組合而來，例：in/on/at which 就可以用 where 來代替

題目：Yellow is also an important color to the Vietnamese, who use it at weddings and also on their flag,  39  it

represents courage, victory, and sacrifice.

拆成2句 → Yellow is also an important color to the Vietnamese, who use it at weddings and also on their flag.

              → It represents courage, victory, and sacrifice at weddings and also on their flag.

此時，「at weddings and also on their flag」= at/on which = where，所以答案會選(B) where

若有錯不吝指教，感恩各位摩友！