阿摩線上測驗
9. _____ the firefighters rushed to the scene, they found the bus driver trapped inside the vehicle.
(A) If
(B) Since
(C) Until
(D) When
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統計： A(1), B(2), C(5), D(22), E(0) #4017207
統計： A(1), B(2), C(5), D(22), E(0) #4017207
