有關形容詞比較級修飾名詞：

Hydrogen, which is ______ than oil, is pretty easy to produce...

答案是d.a much more abundant energy source, 但我的問題是選項b中 an energy source more abundant 為何不對，形容詞比較級做后置定語修飾名詞不是等于省略的定語從句嗎？.. is an enrgy source which is more abundant than oil

選A，是hydrogen和oil作比較。選B 成了energy source和oil作比較了，不符合邏輯。