题目内容
— Tom isn’t happy today. Do you know the_____?
— His dog is ill. That makes him sad.
| A．why | B．world | C．life | D．reason |
D
解析试题分析：句意：-汤姆今天不高兴。你知道原因吗？-他的狗病了。这使他悲伤。A. why为什么；B. world 世界；C. life生活； D. reason理由，原因。结合句意，故选D。
考点：考查名词辨析。
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