单选题 "Somebody saw David ______ an old, deserted mansion this morning." "Oh, he was also noticed ______ smuggling trade there."
【正确答案】 C
【答案解析】[解析] see与notice都是要求用不带to的不定式作其宾语补足语的动词,在主动语态中,to要省略,在被动语态中,to要加上。