52. According to the passage, writing phrase by phrase is _______.
(A) indispensable
(B) economical
(C) undesirable
(D) easily assimilated
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統計: A(6), B(0), C(24), D(5), E(0) #667987
統計: A(6), B(0), C(24), D(5), E(0) #667987