Taken away from his parents at ________ early age, the boy had ________ very difficult life．A.the;/B.an; aC./; aD.an;/
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B解析at an early age在很早的年龄。其他搭配还有：at one’s+数词，或at the age of+数词，意思是“在某人……年龄”；have a…life是短语搭配，意思是“过着一个……生活”，故选择B项。句意为：由于在很小就与父母分开，所以这个男孩过的日子非常艰难。