117. The archival team is currently working on digitizing rare manuscripts to ensure their_______for future generations.
(A) preserve
(B) preservation
(C) preservative
(D) preserved
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統計: A(23), B(443), C(37), D(20), E(0) #3823417
統計: A(23), B(443), C(37), D(20), E(0) #3823417