39. Since 2005, Leonardo da Vinci’s Mona Lisa _____ in a protective glass case for safety requirements.
(A) exhibits
(B) was exhibited
(C) has been exhibited
(D) is exhibiting
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統計: A(20), B(226), C(916), D(36), E(0) #2758266
統計: A(20), B(226), C(916), D(36), E(0) #2758266