问题
选择题
______ by many well-known experts and film stars, the product was very popular at one time.
A．To advocate
B．Having advocated
C．Advocating
D．Advocated
答案
答案：D
考查非谓语动词，主语the product与advocate之间是动宾关系，所以用过去分词advocated，句意：这种产品被许多的著名专家和电影明星所拥护，曾经非常受欢迎。所以选D。