12. It took a lot of work, but after a ___ search of the archives, we finally found the document.
(A) customary
(B) entertaining
(C) messy
(D) thorough
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統計: A(40), B(54), C(97), D(211), E(0) #3637855
統計: A(40), B(54), C(97), D(211), E(0) #3637855