问题
单项选择题
One of the most beautiful natural wonders in the United States must certainly be the Grand Canyon, ______ in Arizona.
A．and located
B．whose location
C．is located
D．which is located
答案
参考答案：D
解析：[分析] 结构识别 本句考察的是非限定性定语从句，因此只有选项D正确。