[单选] The ski resorts are usually crowded． There are many people________skiing．

这是there be句型，不能再有第二个谓语，排除选项A和D。Enjoy doing sth，enjoy后跟动词的-ing形式；want to do sth，want后跟动词不定式。定语从句在说明人时用who。选项C是正确的。【句子大意】滑雪胜地通常人满为患。很多人都喜欢滑雪。