Look out! The train ________.
A．leavesB．is leavingC．has leftD．left
B

試題分析：句意：當(dāng)心！火車(chē)要走了。表示馬上就要發(fā)生的動(dòng)作，通常是短暫性動(dòng)詞，用現(xiàn)在進(jìn)行時(shí)表將來(lái)，選B。
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