In the front of the hall a group of pupils, who were listening to the lecture attentively.
A. were sitting
B. sat
C. sit
D. was sitting
网友回答
A. were sitting
(答案→)B. sat
C. sit
D. was sitting
解析：考查时态。该句是方位词置于句首构成的全部倒装结构，所以句子的主语是a group of pupils。在全部倒装结构中不用进行时态，所以根据定语从句中的谓语“were listening”时态选用一般过去时。所以答案选B。