With a WH-word:— 1come he's failed in the exam?—He's been absent from class for a whole month.
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【正确答案】 1、正确答案：How    
【答案解析】解析：How come意为“为什么，怎么会”，相当于why．但以How come开头的问句仍是陈述句的语序。答案为How。