The sign reads “In case of_________fire，break the glass and push_________red button”.
A./；a B./；the C.an;a D.a;a
The sign reads “In case of_________fire，break the glass and push_________red button”.
A./；a B./；the C.an;a D.a;a
B
fire此处是不可数名词，表示一个概念；“in case of +表概念的抽象名词”是固定习语；the red button 区别于the green button 或the yellow button表示特指的某个东西。