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— 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】

試題分析：句意：-湯姆今天不高興。你知道原因嗎？-他的狗病了。這使他悲傷。A. why為什么；B. world 世界；C. life生活； D. reason理由，原因。結合句意，故選D。

考點：考查名詞辨析。

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