题目内容

【题目】His mother had a bad cold two days . (ago/before)

【答案】ago
【解析】ago 和 before 均可表示在多久时间“以前”(要放在表示一段时间的词语之后)，但有区别：ago 从现在向前回溯，即现在的过去，因此通常与一般过去时连用；而 before 则从过去向前回溯，即指过去的过去，因此通常与过去完成时连用(尤其用于宾语从句中)。本句是一般过去时，故选ago，句意是：他妈妈两天一前患了重感冒。

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