问题补充:
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
答案:
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。