19．Would you please keep quiet？An important announcement ________．（　�。�
A．broadcastsB．is broadcast
C．is being broadcastD．is broadcasting

分析 請(qǐng)保持安靜好嗎？正在播送一個(gè)重要的通知呢．

解答 答案：C
題干中Would you please keep quiet表示說話時(shí)的請(qǐng)求，說明broadcast的動(dòng)作正在發(fā)生，是進(jìn)行時(shí)態(tài)的用法；句中broadcast與主語(yǔ)An important announcement之間構(gòu)成動(dòng)賓關(guān)系，要用被動(dòng)．故選C．

點(diǎn)評(píng) 現(xiàn)在進(jìn)行時(shí)表示正在進(jìn)行的動(dòng)作或存在的狀態(tài)．現(xiàn)在進(jìn)行時(shí)表示動(dòng)作發(fā)生的時(shí)間是"現(xiàn)在"，動(dòng)作目前的狀態(tài)是"正在進(jìn)行中"當(dāng)句子涉及確切的計(jì)劃、明確的意圖和為將來安排好的活動(dòng)時(shí)，現(xiàn)在進(jìn)行時(shí)可用于表示將來．

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