The police are looking for a missing boy, who is believed a white pullover and a blue jeans.
A. wearing
B. to be wearing
C. to wear
D. having worn
网友回答
A. wearing
(答案→)B. to be wearing
C. to wear
D. having worn
解析：考查非谓语动词作宾语补足语用法。根据第一句警察正在寻找一个失踪的男孩，说明谈论的是正在进行的事情，故使用进行式，排除CD。Believe sb to be认为某人…；故后面使用不定式的进行式。B正确。