12 All her attempts to open the box were _______ ; it was sealed with a highly complex lock.
(A) futile
(B) rational
(C) symbolic
(D) theoretical
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統計: A(11), B(0), C(1), D(1), E(0) #3517796
統計: A(11), B(0), C(1), D(1), E(0) #3517796