Look out! The train ________.

A．leaves B．is leaving C．has left D．left 

B

解析試題分析：句意：當(dāng)心！火車要走了。表示馬上就要發(fā)生的動作，通常是短暫性動詞，用現(xiàn)在進(jìn)行時表將來，選B。
考點：考查時態(tài)

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