31 After further ________ , the police said over-speeding was the main factor of the car crash.
(A) obligation
(B) consumption
(C) separation
(D) investigation
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統計: A(48), B(66), C(38), D(493), E(0) #3226373
統計: A(48), B(66), C(38), D(493), E(0) #3226373