21. What does the word “It” in the second paragraph refer to?
(A)The Christian Church.
(B)Singing Gregorian Chant.
(C)The Christian worship in the 6th century.
(D)The name Pope Gregory the Great gave to a chant.
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統計: A(78), B(586), C(84), D(131), E(0) #980575
統計: A(78), B(586), C(84), D(131), E(0) #980575