Have you ever been to Mount Huangshan, is famous for its towering pine forests and sea of

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(答案→)A. which
B. where
C. that
D. what
解析：句意：你去过黄山吗？它是以其高耸的松树林和“云海”而著名的。有逗号隔开，此空是一个非限制性定语从句，不能用that来引导，故排除C。因what不用于引导定语从句，故排除D。从句中缺少主语，所以排除B。which可引导非限制性定语从句，并可作主语。故选A。