问题
When I entered the step-classroom(阶梯教室), the lecture _________ and the people _________ attentively.
A:began, listened
B:was begun, was listening
C:had begun, listened
D:had begun, were listening;
B:was begun, was listening
C:had begun, listened
D:had begun, were listening;
正确答案是：
同类题型
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