【题目】Leonardo da Vinci (1452～1519)________birds kept in cages in order to have the pleasure of setting them free.
A.is said to be buying
B.is said to have bought
C.had said to buy
D.has said to have bought

【答案】B
【解析】句意：据说列奥纳多·达·芬奇买了些养在笼子里的鸟，目的是得到放生时的乐趣。sb is said后接动词不定式，根据句意可知应用不定式的完成形式。