试题题干
Those who began to invade Britain about 500 BC and kept coming until the arrival of the Romans have been known as the （ ）in history.
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正确答案：
试题解析
凯尔特人于公元前500年开始迁居英国，并于此后不断迁入，直至罗马人入侵。
Those who began to invade Britain about 500 BC and kept coming until the arrival of the Romans have been known as the （ ）in history.
凯尔特人于公元前500年开始迁居英国，并于此后不断迁入，直至罗马人入侵。