2. During the crisis, oil prices _____ between $20 and $40 a barrel.
(A) peaked
(B) vibrated
(C) wavered
(D) fluctuated
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統計: A(12), B(19), C(34), D(112), E(0) #881395
統計: A(12), B(19), C(34), D(112), E(0) #881395