题目内容
18．Listen，our teachers ______ Red Songs in the next room．（ ）| A． | sang | B． | are singing | C． | sings |
分析 听！我们的老师们正在隔壁唱红歌．
解答 答案：B 根据祈使句Listen!可知，此句表示动作正在进行，所以用现在进行时态；现在进行时态结构形式为助动词be+v．ing；又因为主语our teachers是名词复数形式，助动词用are．故选B．
点评 判断动词的时态，要通过所给的时间状语或标志词去判断动词存在的状态．注意主谓一致的情况．
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