[文法] 形容詞子句與名詞子句題目
想請問一下這題文法題
20. Ecologists often study issues ____ the effects of human activities upon
populations and ecosystems.
(A) whom relate to
(B) which relates to
(C) that relate to
(D) that they relate to
請問D選項 為何不能解釋成名詞子句，they= issues這樣
明明知道很怪但說不出論點，還請各位賜教，非常感謝!
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