32The fire in the chemical factory set off a series of powerful ________that killed hundreds of people.
(A) exploration
(B) explosion
(C) exclusion
(D) combination
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統計: A(183), B(901), C(210), D(127), E(0) #2939404
統計: A(183), B(901), C(210), D(127), E(0) #2939404