18．Be quiet!The studentsare having（have） an English test in the next room．

分析 安靜！學(xué)生們正在隔壁進(jìn)行英語考試．

解答 答案：are having．結(jié)合前面的be quiet表示請安靜，也就是說考試正在進(jìn)行，故用現(xiàn)在進(jìn)行時am/is/are+doing，主語是the students復(fù)數(shù)，故are，have的現(xiàn)在分詞having，故答案是are having．

點評 現(xiàn)在進(jìn)行時表示正在進(jìn)行的動作或存在的狀態(tài)．現(xiàn)在進(jìn)行時表示動作發(fā)生的時間是"現(xiàn)在"，動作目前的狀態(tài)是"正在進(jìn)行中"．可用來表示現(xiàn)在進(jìn)行時的時間狀語，常用的有：now，this week，at the moment，right now 等；或者告訴你一個準(zhǔn)確的現(xiàn)在時間，或者用look，listen（常用于句子的開頭，表示提醒聽者注意正在發(fā)生的事情）

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