33. The information was of _____ value to the researchers. It led them to one of the greatest findings over the
years.
(A) elective
(B) fleeting
(C) obscure
(D) tremendous
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統計: A(19), B(10), C(22), D(114), E(0) #3102671
統計: A(19), B(10), C(22), D(114), E(0) #3102671