18 It is hard to come to any conclusion given the______ knowledge we have at this stage.
(A) concrete
(B) delicate
(C) rudimentary
(D) thorough
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統計: A(19), B(17), C(40), D(12), E(0) #2886350
統計: A(19), B(17), C(40), D(12), E(0) #2886350