摘要： 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. had said to buy D. has said to have bought Key: 1-4 DDCB
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Leonardo da Vinci(1452－1519)________ birds kept in cages in order to have the pleasure of setting them free．
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A．is said to be buying
B．is said to have bought
C．had said to buy
D．has said to have bought