问题
选择题
The girls______a game called Bomb happily when the teacher suddenly entered the classroom.
A．played
B．were playing
C．are playing
D．had played
答案
答案：B
考查时间状语从句。根据entered可知，主句应该用过去时，排除C、D。句意“那些女孩正在玩一种叫‘Bomb’的游戏，当老师突然走进教室的时候。”根据句意可知，主句应该用进行时。故选B。