【题目】Leonardo da Vinci___________ 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.is said to buy
D.has said to have bought

【答案】B
【解析】句意：据说达·芬奇曾花钱买笼鸟，以便享受放飞它们的快乐。be said to do sth. 意为“据说做某事”。本题中的buy动作发生在say动作以前，故用不定式的完成式。故选B。