阿摩線上測驗
115. Before the digital archive system was implemented, librarians spent hours manually_______ documents for retrieval.
(A) index
(B) indexes
(C) indexing
(D) indexed
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統計： A(22), B(3), C(135), D(35), E(0) #3810337
統計： A(22), B(3), C(135), D(35), E(0) #3810337
