【Amanda】評論
原本的句子Taroko Gorge is a marble canyon which features a rushing whitewater river, towering cliffs, and hiking trails. which作為關係子句which features a rushing whitewater river, towering cliffs, and hiking trails中的主詞,若要省略關係代名詞,後面的主動動詞 features必須改成現在分詞 featuring,因此就變成Taroko Gorge is a marble canyon featuring a rushing whitewater river, towering cliffs, and hiking trails. 故選擇選項(C)