When I entered the step-classroom (阶梯教室), the lecture __________ and the audience __________ attentively.

A．began, listened

B．was begun, was listening

C．had begun, listened

D．had begun, were listening

驾驶人驾驶有达到报废标准嫌疑机动车上路的，交通警察依法予以拘留。