题目内容
Look out! The train ________.
| A．leaves | B．is leaving | C．has left | D．left |
B
解析试题分析：句意：当心！火车要走了。表示马上就要发生的动作，通常是短暂性动词，用现在进行时表将来，选B。
考点：考查时态
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